From: Jeff Garzik <jgarzik@pobox.com>
To: Rob Hughes <rob@robhughes.com>
Cc: linux-ide@vger.kernel.org
Subject: Re: sata_sil performance
Date: Thu, 02 Dec 2004 06:29:59 -0500 [thread overview]
Message-ID: <41AEFCB7.9030108@pobox.com> (raw)
In-Reply-To: <1101680376.5337.5.camel@kahuna-ws.robhughes.com>
Rob Hughes wrote:
> Jeff,
>
> I can understand why you did what you did looking through the code, but
> my drive, a Seagate ST3120026AS, does not need this fix. Further,
> performance has gone from 50-60 Mbit transfers to 14-15 Mbit transfers
> between the 2.6.8 and 2.6.9 kernels. And as a side not, hdparm is
> reporting "HDIO_GET_MULTCOUNT failed: Inappropriate ioctl for device"
> when doing either -I or -i as of this kernel version.
multcount is for PIO transfers, don't worry about it. If you are doing
PIO you are already slower than 15Mbit.
> If you're already working on a patch for this, I'd be happy to test it.
> Also, it should be noted that I'm running FC3, so I'm not sure how much
> that will play into this.
Unfortunately at this time we must judge the situation as "you just
haven't hit the problem yet". Yeah, the performance hit sucks, but the
kernel _must_ be conservative and err on the side of caution.
Jeff
next prev parent reply other threads:[~2004-12-02 11:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-28 22:19 sata_sil performance Rob Hughes
2004-12-02 11:29 ` Jeff Garzik [this message]
2004-12-02 11:50 ` Rob Hughes
-- strict thread matches above, loose matches on Subject: below --
2005-08-17 6:03 Sata_sil performance Ricky
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=41AEFCB7.9030108@pobox.com \
--to=jgarzik@pobox.com \
--cc=linux-ide@vger.kernel.org \
--cc=rob@robhughes.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.