Messages in this thread | | | Date | Mon, 29 Dec 2003 18:25:36 -0500 | From | "David B. Stevens" <> | Subject | Re: 2.6.0 performance problems |
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Thomas,
Have you tried lowering the read ahead in 2.6 to 8.
I don't know what you are doing with your workload but it is possible that you are transferring useless data and clogging the plumbing a bit.
Cheers, Dave
Thomas Molina wrote:
>It certainly looks like DMA is enabled. Under 2.4 I get: > >[root@lap root]# hdparm /dev/hda > >/dev/hda: > multcount = 16 (on) > IO_support = 1 (32-bit) > unmaskirq = 1 (on) > using_dma = 1 (on) > keepsettings = 0 (off) > readonly = 0 (off) > readahead = 8 (on) > geometry = 2584/240/63, sectors = 39070080, start = 0 > > >Under 2.6 I get: > >[root@lap root]# hdparm /dev/hda > >/dev/hda: > multcount = 16 (on) > IO_support = 1 (32-bit) > unmaskirq = 1 (on) > using_dma = 1 (on) > keepsettings = 0 (off) > readonly = 0 (off) > readahead = 256 (on) > geometry = 38760/16/63, sectors = 39070080, start = 0 > >
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