From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Jan Beulich <JBeulich@suse.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 13:38:38 +0100 [thread overview]
Message-ID: <53FB2E4E.7000200@citrix.com> (raw)
In-Reply-To: <53FB49B7020000780002D36A@mail.emea.novell.com>
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?
>
> Jan
>
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.
~Andrew
next prev parent reply other threads:[~2014-08-25 12:38 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 [this message]
2014-08-25 13:02 ` Jan Beulich
2014-08-26 10:29 ` David Vrabel
2014-08-25 13:35 ` max ustermann
2014-08-25 13:50 ` Andrew Cooper
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=53FB2E4E.7000200@citrix.com \
--to=andrew.cooper3@citrix.com \
--cc=JBeulich@suse.com \
--cc=ustermann.max@web.de \
--cc=xen-devel@lists.xen.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).