Messages in this thread | | | Date | Tue, 29 Oct 2002 08:28:40 +0100 | From | Jens Axboe <> | Subject | Re: [PATCH] 2.5.44-ac3, cciss, more scatter gather elements |
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On Mon, Oct 28 2002, Stephen Cameron wrote: > Jens Axboe wrote: > [...] > > It's not a kernel limit. If you queue limits are all beyond 64 entries, > > what you typically see is that you just hit what mpage will fill in for > > you. One thing that should give you max number of sg entries is plain > > and simple: > > > > dd if=/dev/zero of=some_file bs=4096k > > What about > > dd if=/dev/cciss/c0d1p1 of=/dev/null bs=4096k
It's much better to do it with writes, you know the io scheduler will stack those up in a long line, all max size. Reads are more difficult to predict.
-- Jens Axboe
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