Comment 560 for bug 620074
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#560 |
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4d1350f
(Get the code!)
This seems to be a hardware related issue, at least in some cases.
Can the other people experiencing it confirm whether they have a WD Greed hard disk?
Google search for "wd15eads firmware" reveals quite a few people having similar problems.
I have one of these hard disks and I was using it on a fanless VIA Samuel 2 (pre-686) CPU and I was seeing the high IOWait problem and associated poor performance. When I put the same hard disk in a dual AMD opteron it had the same problem.
Then I did a full backup and restore on a different hard disk. It is the same debian system on the same VIA cpu but now the high IOWait times are gone and the performance is adequate for the CPU.
I should point out that the kernel should not suffer poor overall performance during disk I/O even on flakey hardware, especially with swap disabled.
The offending hard disk is now blanked. I can run a few tests with it if somebody is interested.