From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Vrabel <david.vrabel@citrix.com>
Subject: Re: performance save/restore under xen-4.3.2 compared
 to kvm/qemu
Date: Tue, 26 Aug 2014 11:29:34 +0100
Message-ID: <53FC618E.90808@citrix.com>
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To: Jan Beulich <JBeulich@suse.com>, Andrew Cooper <andrew.cooper3@citrix.com>
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On 25/08/14 13:35, Jan Beulich wrote:
>>>> On 25.08.14 at 14:23, <andrew.cooper3@citrix.com> wrote:
>> I have also identified a bottleneck in the Linux PVOps kernel where the
>> mmap batch ioctl takes a batch size of 1024 and generates 1024 batch
>> hypercalls of batch size 1.  Fixing this will certainly make the
>> mapping/unmapping faster.
> 
> Didn't Mats Petersson post a patch for this quite a while ago? Did
> this perhaps never get applied?

I think it needed some reworking and no one else has picked it up yet.

David