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From: Iustin Pop <iusty@k1024.org>
To: "Graham, Simon" <Simon.Graham@stratus.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: Reducing impact of save/restore/dump on Dom0
Date: Tue, 6 Feb 2007 18:36:45 +0100	[thread overview]
Message-ID: <20070206173645.GB6768@teal.hq.k1024.org> (raw)
In-Reply-To: <342BAC0A5467384983B586A6B0B3767104A69BB9@EXNA.corp.stratus.com>

On Tue, Feb 06, 2007 at 10:43:41AM -0500, Graham, Simon wrote:
> Currently, save, restore and dump all used cached I/O in Dom0 to
> write/read the file containing the memory image of the DomU - when the
> memory assigned to the DomU is greater than free memory in Dom0, this
> leads to severe memory thrashing and generally the Dom0 performance goes
> into the toilet.

On linux, there is another way beside O_DIRECT: it's possible to reduce
the memory used for cached writing using the sysctl vm.dirty_ratio; I've
used this to reduce the impact of heavy cached writes on dom0 with good
results.

Maybe it helps for save/dump also...

Regards,
Iustin

  parent reply	other threads:[~2007-02-06 17:36 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-06 15:43 Reducing impact of save/restore/dump on Dom0 Graham, Simon
2007-02-06 16:23 ` John Levon
2007-02-06 17:36 ` Iustin Pop [this message]
2007-02-06 17:46   ` Graham, Simon
2007-02-06 18:35     ` Iustin Pop
2007-02-06 23:00 ` Ian Pratt
2007-02-06 23:20   ` Jeremy Fitzhardinge
2007-02-07  6:40     ` Rusty Russell
2007-02-07  7:41       ` Jeremy Fitzhardinge
2007-02-07 12:11 ` Andi Kleen
2007-02-07 12:52   ` Ian Pratt
2007-02-07 12:58     ` Andi Kleen
2007-02-06 17:25 Graham, Simon
2007-02-06 19:21 Graham, Simon
2007-02-07 12:56 Graham, Simon

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