From: "J. Ryan Earl" <heretic@clanhk.org>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org
Subject: Re: Status of the sata_sil driver for the VT8237
Date: Sun, 28 Mar 2004 14:40:31 -0600 [thread overview]
Message-ID: <4067383F.1030805@clanhk.org> (raw)
In-Reply-To: <4067340A.5080709@pobox.com>
Jeff Garzik wrote:
> Do you really plan to get 300MB/sec from two disks? :)
Yes, for about 50-100ms at a time, and -to- the disks, not from them;
well, the caches anyway. On 133MB/s PCI, more like 150-300ms of
saturation on bursts, and shared with the NICs. I have very short and
bursty I/O patterns as is typical in real-time applications. It's
easier to guarantee latency when your pipes are always at a small
fraction of their potential. 100ms higher latency, even for part of a
second, is quite noticeable in what I serve.
-ryan
PS 2.6 dropped my latencies under load by about 90% over 2.4! We're
talking 40-80ms application response time under high load to 8-10ms
under high load. <3
prev parent reply other threads:[~2004-03-28 20:42 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-28 2:10 Status of the sata_sil driver for the VT8237 J. Ryan Earl
2004-03-28 3:16 ` Jeff Garzik
2004-03-28 3:47 ` J. Ryan Earl
2004-03-28 7:37 ` Stefan Smietanowski
2004-03-28 7:48 ` J. Ryan Earl
2004-03-28 20:22 ` Jeff Garzik
2004-03-28 20:40 ` J. Ryan Earl [this message]
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