Messages in this thread | | | Date | Mon, 29 Dec 2003 21:09:34 -0800 | From | William Lee Irwin III <> | Subject | Re: 2.6.0 performance problems |
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On Tue, 2003-12-30 at 00:58, Thomas Molina wrote: >> It certainly looks like DMA is enabled. Under 2.4 I get: >> [root@lap root]# hdparm /dev/hda [...] >> readahead = 8 (on) [...] >> Under 2.6 I get: >> [root@lap root]# hdparm /dev/hda [...] >> readahead = 256 (on)
On Tue, Dec 30, 2003 at 01:14:45AM +0200, Martin Schlemmer wrote: > Increase your readahead: > # hdparm -a 8192 /dev/hda > BTW: As we really do get this question a _lot_ of times, why > don't the ide layer automatically set a higher readahead > if there is enough cache on the drive or something?
Could you try lowering 2.6's readahead to 2.4's levels in order to rule out readahead-induced thrashing?
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