Messages in this thread |  | | Date | Tue, 13 Nov 2001 14:18:42 -0200 (BRST) | From | Marcelo Tosatti <> | Subject | Re: Tuning Linux for high-speed disk subsystems |
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On Tue, 13 Nov 2001, Craig I. Hagan wrote:
> > After some testing at Compaq's lab in Oslo, I've come to the conclusion > > that Linux cannot scale higher than about 30-40MB/sec in or out of a > > hardware or software RAID-0 set with several stripe/chunk sizes tried out. > > The set is based on 5 18GB 10k disks running SCSI-3 (160MBps) alone on a > > 32bit/33MHz PCI bus. > > this isn't quite true. use either the RH kernel, the -ac series, or the > attached patch (for 2.4.15-pre4). Then set /proc/sys/vm/max-readahead to 511 or > 1023 (power of 2 minus 1) > > this should allow you to generate large enough io's for streaming reads to do > what you are looking for.
Craig,
This patch is already on my pending list.
So if Linus does not apply it, I will.
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