Re: Once an hour hard drive access delay
- From: David Starr <mittersill@xxxxxxxxxxxxxx>
- Date: Fri, 03 Aug 2007 09:23:30 -0400
Andrew E. wrote:
Most xp services are used,however to see a list from intel,go to:http://www.intel.com/cd/ids/developer/asmo-na/eng/189869.htm?prn=Y
Page 6,this configuration & stopped services was applied for testing,one can
stop as listed,and restart as its needed....
"Asunga" wrote:
Hi, I've written a small Visual C++ DOS window program for a special project that continoulsly access (read or write a fixed file length) addon hard drives attached to the SATA port of the motherboard or an addon SATA controller, it measures and records access time of each read command sent to them.
Typically, each access is about 50ms in latency which is what I expect. But exactly once an hour on the hour of the system boot, I get a couple of access delays that is in the order of 150 to 300ms. This is seen on all the drives being measured.
Don't see this on FireWire or USB disks, just SATA connected drives. Have not tested PATA or other devices yet.
So here is the question, is there anything that you guys can think of that I might be able to turn off on XP that could contribute to this? I've disabled System Update check and does not help. Anything thing else?
Asunga.
We used to see this kinda thing when we were doing video capture some years ago. Turned out that the Windows handicapped access support was doing some sluggish check of something or other that locked up the machine long enough to drop a few frames of video. We fixed it by getting into Install and Remove Programs and removing all handicapped support. While you ar at it, get rid of indexing services, IIS, windows messenger and anything else you don't need. Then get into Administrative services and turn off as many as possible. Be careful with services, disabling some will kill Windows so hard it won't boot. There are good websites listing good and bad services which will turn up for a quick google. Try "Services XP" for a search object.
David Starr
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