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Re: [Xen-devel] PATCH: Jeremy's linux 2.6.33-pvops: wrong gntdev

To: Michael Brade <brade@xxxxxxx>
Subject: Re: [Xen-devel] PATCH: Jeremy's linux 2.6.33-pvops: wrong gntdev
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Wed, 04 Aug 2010 12:21:55 -0700
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 On 08/04/2010 11:43 AM, Michael Brade wrote:
XFS has been my filesystem of choice for at least 5 years I think. Never had
any issues with it. Before I used reiserfs and before that I had ext2/3 but
that one gave me too many problems so I never tried it again.

Would you recommend anything else instead?

I ask because xfs does some memory mapping tricks which are actually fairly awkward to handle in a PV Xen domain. We end up disabling its lazy vunmap behaviour, which means there's a bit more overhead from tlb flushes and the like. I don't know what kind of performance effect that actually has, or in what circumstances.


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