From: Larry McVoy <lm@bitmover.com>
To: Andrew Morton <akpm@osdl.org>
Cc: Hanna Linder <hannal@us.ibm.com>,
lse-tech@lists.sourceforge.net, linux-kernel@vger.kernel.org
Subject: Re: Minutes from 10/1 LSE Call
Date: Wed, 1 Oct 2003 16:38:15 -0700 [thread overview]
Message-ID: <20031001233815.GB29605@work.bitmover.com> (raw)
In-Reply-To: <20031001162916.5fc2241b.akpm@osdl.org>
On Wed, Oct 01, 2003 at 04:29:16PM -0700, Andrew Morton wrote:
> If you have a loop like:
>
> char *buf;
>
> for (lots) {
> read(fd, buf, size);
> }
>
> the optimum value of `size' is small: as little as 8k. Once `size' gets
> close to half the size of the L1 cache you end up pushing the memory at
> `buf' out of CPU cache all the time.
I've seen this too, not that Andrew needs me to back him up, but in many
cases even 4k is big enough. Linux has a very thin system call layer so
it is OK, good even, to use reasonable buffer sizes.
--
---
Larry McVoy lm at bitmover.com http://www.bitmover.com/lm
next prev parent reply other threads:[~2003-10-01 23:38 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-01 19:19 Minutes from 10/1 LSE Call Hanna Linder
2003-10-01 23:29 ` Andrew Morton
2003-10-01 23:38 ` Larry McVoy [this message]
2003-10-02 0:23 ` Jeff Garzik
2003-10-02 18:56 ` insecure
2003-10-02 19:10 ` Jeff Garzik
2003-10-02 22:38 ` insecure
2003-10-02 22:45 ` Hanna Linder
2003-10-05 5:38 ` Andrew Morton
2003-10-02 19:21 ` [Lse-tech] " Steven Pratt
2003-10-02 19:36 ` Andrew Morton
2003-10-03 19:33 ` Steven Pratt
2003-10-03 20:13 ` Andrew Morton
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