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]
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