Hardware & Devices

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Re: Intel DP55WG PITA fat_boy20-Jan-11 2:55 fat_boy 20-Jan-11 2:55  Ah, I thought you didnt get the BIOS up. Even without a CPU you would still get a BIOS. "It is a remarkable fact that despite the worldwide expenditure of perhaps US$50 billion since 1990, and the efforts of tens of thousands of scientists worldwide, no human climate signal has yet been detected that is distinct from natural variation." Bob Carter, Research Professor of Geology, James Cook University, Townsville Re: Intel DP55WG PITA Dan Neely20-Jan-11 5:05 Dan Neely 20-Jan-11 5:05  In general each new generation of CPU will need slightly different settings to work; getting the settings to the board requires a firmware update. The board may be new to you, but if it was made before the CPU it doesn't matter... 3x12=36 2x12=24 1x12=12 0x12=18 Boot Record of hard disk A_Fa16-Jan-11 1:07 A_Fa 16-Jan-11 1:07  Hi. Excuse me about my bad english. I develop First stage of a bootloader. Now I write it in first sector (sector number 0) of a hard disk. Then attach that hard disk to the system. When I turn on that system, it can't found my bootloader and run old bootloader that saved in hard disk. I search first 1,000,000 sectors of hard disk but old bootloader not found. What is location of old bootloader? If I Know it's location, I can write my bootloader in that location then BIOS can find my bootloader and run it. Thanks alot. USB "lockout" when connecting and disconnecting HID device dybs14-Jan-11 15:55 dybs 14-Jan-11 15:55  What is the best way to go about debugging this issue (in addition to google?) When we unplug and replug a custom HID device enough times on a low-ish-end machine (XP Pro SP3), Windows stops recognizing new USB connects and disconnects on any USB port (any device class). We turned on the Driver Verifier, and got a 0xC9 bugcheck (DRIVER_VERIFIER_IOMANAGER_VIOLATION), with an error code of 0x21D (An IRP dispatch handler has not properly detached from the stack below it upon receiving a remove IRP - Not entirely sure what that means, but from what I've read on MSDN (See Summary of Guidelines for Pending IRPs)[^], it looks like something is keeping the "post-processing" from running on a disconnect). The driver file that was referenced is HIDCORE.SYS (I think...I didn't actually see the error, this is what my colleague told me). We are using the HID driver built into Windows. The problem only occurs when a utility we wrote is running that sends a few commands to the device. While this utility is running, we can connect and disconnect the device any from 3 to 30 times before the USB "locks up". Any connected devices still work, but no new connect/disconnect events are recognized. It's most reproducible on lower-end machines, but will occasionally happen on a medium-end PC. The only way out of this is to reboot. We've made sure we're closing all our file handles to the device when we get a disconnect event. We don't have a whole lot of experience debugging low-level driver-related problems. Any suggestions would be greatly appreciated. I'm sure there's some bit of information I'm missing, but any suggestions would be greatly appreciated. Dybs The shout of progress is not "Eureka!" it's "Strange... that's not what i expected". - peterchen Re: USB "lockout" when connecting and disconnecting HID device fat_boy16-Jan-11 21:01 fat_boy 16-Jan-11 21:01  Is your app registering for device plug and play events using RegisterDeviceNotification? And dont forgwet its a two stage, first you register for events by device classm then by handle when your device arrives. Faiing to handle this wil screw up the windows plug and play state and leave drivers locked in memory (which is what you have here). "It is a remarkable fact that despite the worldwide expenditure of perhaps US$50 billion since 1990, and the efforts of tens of thousands of scientists worldwide, no human climate signal has yet been detected that is distinct from natural variation." Bob Carter, Research Professor of Geology, James Cook University, Townsville Solid State Drives Alan Kurlansky11-Jan-11 10:39 Alan Kurlansky 11-Jan-11 10:39  In a Windows C++ environment during writing to a log file I observe a periodic hiccup of approx 16 milliseconds in between writes. So I wrote a little function that writes out 20,000 sequentially numbered messages using a while loop. Approximately every 3000 to 4000 messages I see a 16 millisecond delay. This is with no programmatic flushing. With flushing after each write it happens after approx. every 2000 messages. How can I get around this recurring hiccup? Would a solid state disk solve this problem? Or at least dramatic reduce the hiccup time? Thanks ak Re: Solid State Drives [modified] Luc Pattyn11-Jan-11 10:56 Luc Pattyn 11-Jan-11 10:56  I suggest you calculate the number of bytes moved in between two hiccups, and I bet it will be a multiple of the sector size (512B), possibly simply the cluster size (which could be the next power of 2 multiple of 512B that exceeds the partition size divided by 64K). What probably is happening is a new cluster needs to be allocated, causing an update of the FAT table. A possible workaround would be to preallocate the file, which implies you need to know and allocate the maximum size before you start writing the data. A possible approach is by using a "memory mapped file". AFAIK solid state disks are faster, especially when reading data and hopping around (their seek time is much better). So the same problem would exist, at a much smaller scale. Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code. modified on Tuesday, January 11, 2011 7:41 PM Re: Solid State Drives Jörgen Andersson12-Jan-11 1:04 Jörgen Andersson 12-Jan-11 1:04  Luc Pattyn wrote: AFAIK solid state disks are faster, especially when reading data and hopping around (their seek time is much better). So the same problem would exist, at a much smaller scale. You have a potential much bigger problem with SSDs. You cant erase single cells in an SSD, but instead it erases pretty large blocks of data (usually 128kB). So if you change a few bytes in a file, the drive will write another block, and mark the original block for deletion, and do the actual delete whenever it's idle. If you use an SSD for logging purposes, it might never get idle for long enough to get the erasing done and you would end up with a drive that's not having any free blocks despite being far from full. When this happens you will get a hiccup of a totally different magnitude. List of common misconceptions Re: Solid State Drives Luc Pattyn12-Jan-11 2:16 Luc Pattyn 12-Jan-11 2:16  Interesting. So for continuous writes, the app should not flush, and one should have Windows cache the file in chunks that correspond to the block size of the SSD, avoiding almost all partial-block writes. Not sure that can be organized easily. Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code. Re: Solid State Drives Dan Neely12-Jan-11 2:35 Dan Neely 12-Jan-11 2:35  Even in a degraded state (and forcing that is getting hard even for benchmarkers) a current generation SSD will still outperform a mechanical drive. 3x12=36 2x12=24 1x12=12 0x12=18 Re: Solid State Drives Alan Kurlansky12-Jan-11 3:58 Alan Kurlansky 12-Jan-11 3:58  The original response talks about preallocating files. I'd like to try an experiment with this approach and just see what the improvement is. Can anyone suggest some VS c++ code that will accomplish this. 1) preallocated file creation, that would be reused with each running of the program 2) code that opens the file 3) code that sequencially writes ascii data msgs to the file starting at the beginning. Thanks Re: Solid State Drives Jörgen Andersson12-Jan-11 4:07 Jörgen Andersson 12-Jan-11 4:07  Yes it will indeed. And in all normal use you won't notice it at all. List of common misconceptions Re: Solid State Drives Alan Kurlansky12-Jan-11 4:28 Alan Kurlansky 12-Jan-11 4:28  The original response talks about preallocating files. I'd like to try an experiment with this approach and just see what the improvement is. Can anyone suggest some VS c++ code that will accomplish this. 1) preallocated file creation, that would be reused with each running of the program 2) code that opens the file 3) code that sequencially writes ascii data msgs to the file starting at the beginning. Thanks One server hdd vs two normal hdd connected into RAID vonpik10-Jan-11 11:35 vonpik 10-Jan-11 11:35  Hi guys! I'm concerning situation, what will do the job quicker. One server hdd, for example WD VelociRaptor, 3.5'', 300GB, Serial ATA/300, 10000RPM, 16MB cache, or two WD Caviar Black, 3.5'', 1TB, SATA/600, 7200RPM, 64MB cache connected into RAID 0. For me, intuitively raid will be quicker, but some test or personal experience will be useful. Unfortunately I never worked with raid so I only know the theory about it. I know that there is double chance to data loss with raid 0 but I'm planning to buy third external hdd which will be working as a backup storage. I don't wan't to create raid 1+0 because of lack of founds to buy more hdd's. In the price of one 300GB server disk I can get two 1 TB disks. What are you thinking about such situation? The computer will work as a render machine, mostly for 3ds max and autocad as well, so the speed of disk is quite important matter for me. Oh! And I'm planning to use raid controller to relieve processor from counting all that stripe stuff. Re: One server hdd vs two normal hdd connected into RAID Jörgen Andersson11-Jan-11 11:37 Jörgen Andersson 11-Jan-11 11:37  First of all, there isn't as big difference performancewise between those disks as you might think. The velociraptor has only a slightly higher sustained datarate, and if you would consider the 1.5 TB Caviar, it's even slower. But the latency is 30% lower. It's also serverclass when it comes to reliability, which the caviar certainly isn't. So it's more about how you're going to use the drives that makes the difference. If you read or write very large contiguous files in one go, the raid system is the clear winner. But if you read or write very many small files, then the single velociraptor will be the better choice. Also keep in mind that a cheap raid controller isn't fast. Check the sustained write speed if available. If you really want a fast system, you should consider one of these[^] instead. List of common misconceptions Dual socket Core i5 2500K versus Core i7 2600K T210210-Jan-11 3:01 T2102 10-Jan-11 3:01  Does anyone know where I might find application benchmarks for dual socket core i5 2500K versus one and two socket core i7 2600K? Curious about Excel and compiler benchmarks. Is overclocking effective with dual socket machines with or without liquid cooling? Note that this will be for my personal machine that I will program on at home and not for a server, etc. Re: Dual socket Core i5 2500K versus Core i7 2600K Dan Neely10-Jan-11 4:28 Dan Neely 10-Jan-11 4:28  I haven't seen any 2 socket benchmarks yet. Annand did a compiler benchmark with single socket systems. The catch with overclocking is that in general 2 socket boards are intended for servers and have minimal hardware support (most notably they typically don't have VRMs capable of handling the excess load, or the extra heat it produces) even if it's allowed in the BIOS. 3x12=36 2x12=24 1x12=12 0x12=18 Re: Dual socket Core i5 2500K versus Core i7 2600K T210210-Jan-11 19:03 T2102 10-Jan-11 19:03  Thanks. I'll probably go with single socket overclocking 2600K or dual socket 2500 without overclocking if I find a two socket board in the next month. Re: Dual socket Core i5 2500K versus Core i7 2600K Dan Neely11-Jan-11 2:29 Dan Neely 11-Jan-11 2:29  I didn't occur to me at the time, but you're not going to find a 2 socket 1155 board because it's not a supported configuration (no QPI to link the chips). On the Intel side you'll have to wait until Q3 for LGA 2011 to launch before you can get multi-socket support for Sandybridge. 3x12=36 2x12=24 1x12=12 0x12=18 USB in XP- external drive does not always "connects". Vaclav_18-Dec-10 5:41 Vaclav_ 18-Dec-10 5:41  Out of necessity ( I am developing video appliocation and need more than one webcam) - my cheap webcams did not come with driver for win 2000 - I switched to XP (SONY home edition). I heve an external USB drive which holds all my development archive. This drive and other USB devices worked and attached to my Windows 2000 via D-link hub and switch box ( I have two dev mashines) just fine and every time (on powerup). Now I need to restart the XP often before the Disk Manager "registers" the external drive. I tryed motherboard USB ports ( back and front)and PCI USB (5 ports) card. Same results. I have these devices on the USB - 4 webcams, external drive,USB hub with serial port adapter( ham radio), scanner, MS wireless keboard / mouse.flash drive. All of them have some intermittent issues. I guess the qestion is - how to debug USB and find out what is happenning here. Once I got some message about "bandwith 70% usage" problem but I have no clue what to do with it. It wants me to "unplug" device which is stupid because if it slows dow I do not care, my apps is bulid with checks for that. Anyway, could someone kindly shed some light on this USB behavior. Thanks for reading. Vaclav PS All of the devices worked on Win 2000, some of them are powered, it cannot be a power issue. Re: USB in XP- external drive does not always "connects". fat_boy31-Dec-10 2:08 fat_boy 31-Dec-10 2:08  XP changed the way drives load in order to speed up the boot process. Now, you get a GUI up in about 4 seconds, thats completely useless for 26 seconds because none of the HW is attached yet, and explorer is locked waiting for the network to connect. This is clearly an improvement over 2k, where you just waited 30 seconds for the GUI to come up... Anyway, USB, where to start... OK, it sucks. Its the lamest, buggiest, lest observed standardwise, most indifferently supported at hub level protocol ever seen. Advice? For gods sake dont use Vista, its worse. As for XP, what does device manager say when the USB drive has not been recognised? "It is a remarkable fact that despite the worldwide expenditure of perhaps US$50 billion since 1990, and the efforts of tens of thousands of scientists worldwide, no human climate signal has yet been detected that is distinct from natural variation." Bob Carter, Research Professor of Geology, James Cook University, Townsville Re: USB in XP- external drive does not always "connects". Vaclav_31-Dec-10 4:09 Vaclav_ 31-Dec-10 4:09  Thanks for reply. I foolishly though it was only XP SP3 problem! And it is not only on startup! In addition of "ignoring" USB hub at statup I have also observed that unplugging / plugging directly connected ( not via D link) devices is also ignored by XP. I needed to switch to XP so I can use Logitech webcams, no other reason. The biggest problem is that I have wireless keyboard / mouse also connected via the D-link hub! For all practical purposes my USB is useless in XP. My personal opinion - MS is in hardware development business and should stay there. I always say the reason that CD was "invented" was because it was impractical to load Windows using two dozen 3 1/2 floppies! They obviously have no business in operating system development since they cannot get it together after all these years. Too bad general public does not see that. If Windows 2011 will make coffee they will all line up for it! Vaclav PS I'll check the Device Manager next time. Re: USB in XP- external drive does not always "connects". fat_boy17-Jan-11 5:50 fat_boy 17-Jan-11 5:50  Yeah, check device manager. You will see a great big yellow exclamaitn mark on the fialed device. Also, how does the HW work on other laptops? Becauae god knows USB host controllers can be very VERY variable in quality so dont blame MS, they just make the OS, its someone else made the HW... "It is a remarkable fact that despite the worldwide expenditure of perhaps US$50 billion since 1990, and the efforts of tens of thousands of scientists worldwide, no human climate signal has yet been detected that is distinct from natural variation." Bob Carter, Research Professor of Geology, James Cook University, Townsville Laptop Keyboard Problem Roger Wright16-Dec-10 11:37 Roger Wright 16-Dec-10 11:37  I've got a Dell laptop that has developed an odd problem. As I type, about halfway through a sentence I look up and realize that the cursor has jumped backwards several words, and the characters I'm typing are appearing in the middle of other words earlier in the line. It's completely random, and is not associated with any particular key. The backwards leap always stays within the same line of the display, as well; it doesn't VT to a previous line. It's as if the keyboard is generating a random CR withut the LF, except that it doesn't back up all the way to the left side of the line. It more often is a few characters in from the left side. I have another identical laptop which is thoroughly dead, but before I go to the effort of trying to swap keyboards I thought I'd ask... Is this likely to be just a keyboard problem, or is it probable that this is something more insidious? Will Rogers never met me. Re: Laptop Keyboard Problem [modified] Luc Pattyn16-Dec-10 11:51 Luc Pattyn 16-Dec-10 11:51  Any chance you are (nearly) touching the touchpad/trackpad while typing? happens to me on occasion. Staying in the same line is odd. Does it happen in multiple applications? If yes, write a little test app that logs all the keyboard [ADDED] and mouse [/ADDED] events, and match them up with your actual typing. [ADDED] If need be, you can change the touchpad's sensitivity through the Mouse Control Panel. [/ADDED] Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code. modified on Thursday, December 16, 2010 7:28 PM

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