From: Jens Axboe <axboe@suse.de>
To: Stephen Cameron <steve.cameron@hp.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] 2.5.44-ac3, cciss, more scatter gather elements
Date: Tue, 29 Oct 2002 08:28:40 +0100 [thread overview]
Message-ID: <20021029072840.GM2937@suse.de> (raw)
In-Reply-To: <20021028171016.A903@zuul.cca.cpqcorp.net>
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
next prev parent reply other threads:[~2002-10-29 7:22 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-28 23:10 Stephen Cameron
2002-10-29 7:28 ` Jens Axboe [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-10-30 20:23 Stephen Cameron
2002-10-25 22:06 Cameron, Steve
2002-10-28 15:24 ` Jens Axboe
2002-10-25 20:47 Cameron, Steve
2002-10-25 21:11 ` Jens Axboe
2002-10-25 21:24 ` Jens Axboe
2002-10-25 21:25 ` Jens Axboe
2002-10-25 21:31 ` Jens Axboe
2002-10-25 20:00 Stephen Cameron
2002-10-25 19:59 Stephen Cameron
2002-10-25 20:24 ` Jens Axboe
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