Messages in this thread |  | | Date | Fri, 05 Oct 2001 11:19:03 +0200 | From | Reto Baettig <> | Subject | RAW I/O Performance |
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Hi
We are using RedHat's 2.4.3-12 kernel for our Alpha machines and stumbled over a bad performance problem with raw devices:
Our test results (with a couple of disks and controllers ;-) were:
Kernel 2.2.18 ~200MB/s 95% idle Kernel 2.4.3-12(RH) ~105MB/s 0% idle Kernel 2.4.11-pre3 ~173MB/s 28% idle
The 2.2.18 kernel is using the SGI raw device patches.
I saw that Andrea had a patch for 2.4.3aa where he could improve the RAW I/O performance significantly. I looked at the patch and I could not apply it to 2.4.3-12 because of conflicts which I was not able to resolve.
I also looked at 2.4.10 and saw that Andreas patch was not in there.
How can I get a similar RAW-IO performance with 2.4.3-12 as I had with 2.2.18?
TIA
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