From: "Jan Beulich" <JBeulich@suse.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: ustermann.max@web.de, xen-devel@lists.xen.org
Subject: Re: performance save/restore under xen-4.3.2 compared to kvm/qemu
Date: Mon, 25 Aug 2014 14:02:04 +0100 [thread overview]
Message-ID: <53FB4FEC020000780002D3BE@mail.emea.novell.com> (raw)
In-Reply-To: <53FB2E4E.7000200@citrix.com>
>>> On 25.08.14 at 14:38, <andrew.cooper3@citrix.com> wrote:
> 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?
>
> That was a different issue if I remember correctly. I think it was to
> do with the classic kernel using ioremap() for foreign domain memory.
I certainly remember that patch having been against pv-ops...
Jan
next prev parent reply other threads:[~2014-08-25 13:02 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-25 12:06 performance save/restore under xen-4.3.2 compared to kvm/qemu ustermann.max
2014-08-25 12:23 ` Andrew Cooper
2014-08-25 12:35 ` Jan Beulich
2014-08-25 12:38 ` Andrew Cooper
2014-08-25 13:02 ` Jan Beulich [this message]
2014-08-26 10:29 ` David Vrabel
2014-08-25 13:35 ` max ustermann
2014-08-25 13:50 ` Andrew Cooper
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