Messages in this thread | | | From | James Finnie <> | Subject | RE: VIA IDE performance under 2.6.0-test7/8? | Date | Wed, 22 Oct 2003 12:11:00 +0100 |
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> Can you also send the output from "cat /proc/interrupts". > It looks like you are not using IO-APIC, but instead using XT-PIC. > XT-PIC is a lot slower than IO-APIC.
I am indeed using the XT-PIC, but I was using it under 2.4.21 also, so I doubt that is the cause of the problems, especially seeing as bartlomiej's suggestion of increasing the read-ahead caching worked a treat.
* Does anyone know why the values of the read-ahead caching are so different between 2.4.x and 2.6.0-test7/8? It seems to me that there are two problems; A) the meaning of the readahead value has changed (almost guaranteed, as in 2.4.21 I can't set anything above 255) B) the default of 256 is low, as the default in 2.4 of 8 gave me 40Mb/sec and the default of 256 in 2.6 gives me only 13Mb/s!
I couldn't see any reference to this change of behaviour anywhere on the kernel mailing list archives.
> Just turn on SMB support in the "make menuconf", and it should enable > IO-APIC.
I'll give it a go just in case, however I don't like building kernels with SMP when I have no need for it.
Cheers
James
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