From: Keir Fraser <keir@xensource.com>
To: "Graham, Simon" <Simon.Graham@stratus.com>,
Keir Fraser <keir@xensource.com>,
xen-devel@lists.xensource.com
Subject: Re: [PATCH][TOOLS] Reducing impact ofdomainsave/restore/dump on Dom0
Date: Wed, 21 Feb 2007 15:10:21 +0000 [thread overview]
Message-ID: <C202115D.9DAA%keir@xensource.com> (raw)
In-Reply-To: <342BAC0A5467384983B586A6B0B3767104BE068C@EXNA.corp.stratus.com>
On 21/2/07 15:06, "Graham, Simon" <Simon.Graham@stratus.com> wrote:
> 2. sync-then-advise is only done at the end of writing a file to ensure
> that all
> of the cached pages are discarded. Whilst writing the file, I only
> fadvise
> which triggers a write back and discards any clean pages up to the
> specified offset.
> This is indeed a performance thing -- fsyncing on every write makes
> it very slow.
Do you need the fsync at all? It's possible that the kernel will
launder-then-discard the affected pages automatically, just from the
fadvise() alone.
-- Keir
next prev parent reply other threads:[~2007-02-21 15:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-21 15:06 [PATCH][TOOLS] Reducing impact ofdomainsave/restore/dump on Dom0 Graham, Simon
2007-02-21 15:10 ` Keir Fraser [this message]
-- strict thread matches above, loose matches on Subject: below --
2007-02-21 15:22 Graham, Simon
2007-02-22 2:10 ` Robert Read
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