From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: dank@kegel.com (Dan Kegel)
Cc: linux-kernel@vger.kernel.org (linux-kernel@vger.kernel.org)
Subject: Re: O_DIRECT please; Sybase 12.5
Date: Fri, 29 Jun 2001 10:50:15 +0100 (BST) [thread overview]
Message-ID: <E15Fuul-0008SJ-00@the-village.bc.nu> (raw)
In-Reply-To: <3B3C4CB4.6B3D2B2F@kegel.com> from "Dan Kegel" at Jun 29, 2001 02:39:00 AM
> the boss say "If Linux makes Sybase go through the page cache on
> reads, maybe we'll just have to switch to Solaris. That's
> a serious performance problem."
Thats something you'd have to benchmark. It depends on a very large number
of factors including whether the database uses mmap, the average I/O size
and the like
> It supports raw partitions, which is good; that might satisfy my
> boss (although the administration will be a pain, and I'm not
> sure whether it's really supported by Dell RAID devices).
> I'd prefer O_DIRECT :-(
We already support raw direct I/O to devices themselves so they should support
that - if not then Oracle I believe already does.
next prev parent reply other threads:[~2001-06-29 9:51 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-06-29 9:39 Dan Kegel
2001-06-29 9:50 ` Alan Cox [this message]
2001-06-29 10:16 ` Dan Kegel
2001-06-29 12:49 ` Mike Harrold
2001-07-05 13:59 ` Andrea Arcangeli
2001-06-29 15:23 ` Steve Lord
2001-07-03 9:42 ` Stephen C. Tweedie
2001-07-03 15:10 ` Daryll Strauss
2001-07-03 15:48 ` Stephen C. Tweedie
2001-07-05 13:53 ` Andrea Arcangeli
2001-07-05 14:28 ` Andrew Morton
2001-07-05 14:37 ` Andrea Arcangeli
2001-07-05 15:06 ` Andrew Morton
2001-07-06 0:25 ` Keith Owens
[not found] <3B3C4CB4.6B3D2B2F@kegel.com.suse.lists.linux.kernel>
2001-06-29 10:42 ` Andi Kleen
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