From: Christoph Hellwig <hch@infradead.org>
To: Michael Tokarev <mjt@tls.msk.ru>
Cc: Thomas Mueller <thomas@chaschperli.ch>, kvm@vger.kernel.org
Subject: Re: Shouldn't cache=none be the default for drives?
Date: Thu, 8 Apr 2010 06:08:35 -0400 [thread overview]
Message-ID: <20100408100835.GA29089@infradead.org> (raw)
In-Reply-To: <4BBD7215.3080204@msgid.tls.msk.ru>
On Thu, Apr 08, 2010 at 10:05:09AM +0400, Michael Tokarev wrote:
> LVM volumes. This is because with cache=none, the virtual disk
> image is opened with O_DIRECT flag, which means all I/O bypasses
> host scheduler and buffer cache.
O_DIRECT does not bypass the I/O scheduler, only the page cache.
prev parent reply other threads:[~2010-04-08 10:08 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-07 14:39 Shouldn't cache=none be the default for drives? Troels Arvin
2010-04-07 15:17 ` Gordan Bobic
2010-04-08 5:07 ` Thomas Mueller
2010-04-08 6:05 ` Michael Tokarev
2010-04-08 6:09 ` Thomas Mueller
2010-04-08 6:23 ` Thomas Mueller
2010-04-08 10:08 ` Christoph Hellwig [this message]
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=20100408100835.GA29089@infradead.org \
--to=hch@infradead.org \
--cc=kvm@vger.kernel.org \
--cc=mjt@tls.msk.ru \
--cc=thomas@chaschperli.ch \
/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.