From: Jeff Garzik <jgarzik@pobox.com>
To: insecure@mail.od.ua
Cc: Larry McVoy <lm@bitmover.com>, Andrew Morton <akpm@osdl.org>,
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: Thu, 02 Oct 2003 15:10:04 -0400 [thread overview]
Message-ID: <3F7C780C.9040001@pobox.com> (raw)
In-Reply-To: <200310022156.49678.insecure@mail.od.ua>
insecure wrote:
> That sounds reasonable, but today's RAM throughput is on the order
> of 1GB/s, not 100Mb/s. 'Out of L1' theory can't explain 100Mb/s ceiling
> it seems.
cp(1) data, at least, will never ever be in L1. Copying data you need
to look at the ends of the pipeline -- hard drive throughput, PCI bus
bandwidth, FSB bandwidth, speed at which ext2/3 allocates blocks, and
similar things are likely bottlenecks.
You'll never hit RAM bandwidth limits, unless your copies are extremely
tiny, and entirely in L2 or pagecache.
Jeff
next prev parent reply other threads:[~2003-10-02 19:10 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
2003-10-02 0:23 ` Jeff Garzik
2003-10-02 18:56 ` insecure
2003-10-02 19:10 ` Jeff Garzik [this message]
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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