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Re: [Qemu-devel] [PATCH v5 0/7] Migration: Remove copying of guest ram p
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] [PATCH v5 0/7] Migration: Remove copying of guest ram pages |
Date: |
Wed, 27 Mar 2013 15:27:46 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130311 Thunderbird/17.0.4 |
On 03/22/2013 08:47 AM, Orit Wasserman wrote:
> In migration all data is copied to a static buffer in QEMUFile,
> this hurts our network bandwidth and CPU usage especially with large guests.
> We switched to iovec for storing different buffers to send (even a byte field
> is
> considered as a buffer) and use sendmsg to send the iovec.
> Adjacent iovecs are coalesced to create a bigger buffer instead of many small
> buffers.
>
> Guest memory pages are not copied by calling a new function
> qemu_put_buffer_async.
> The page header data and device state data are still copied into the static
> buffer. This data consists of a lot of bytes and integer fields and the static
> buffer is used to store it during batching.
>
> git repository: git://github.com/oritwas/qemu.git sendv_v2
>
> Changes from v4:
> return ssize_t for writev_buffer ops.
> Fix other Eric's comments.
> Squash patch 8 (coalesce adjacent iovecs) into patch 4.
Series:
Reviewed-by: Eric Blake <address@hidden>
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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- [Qemu-devel] [PATCH v5 0/7] Migration: Remove copying of guest ram pages, Orit Wasserman, 2013/03/22
- [Qemu-devel] [PATCH v5 1/7] Add QemuFileWritevBuffer QemuFileOps, Orit Wasserman, 2013/03/22
- [Qemu-devel] [PATCH v5 2/7] Add socket_writev_buffer function, Orit Wasserman, 2013/03/22
- [Qemu-devel] [PATCH v5 3/7] Update bytes_xfer in qemu_put_byte, Orit Wasserman, 2013/03/22
- [Qemu-devel] [PATCH v5 4/7] Store the data to send also in iovec, Orit Wasserman, 2013/03/22
- [Qemu-devel] [PATCH v5 5/7] Use writev ops if available, Orit Wasserman, 2013/03/22
- [Qemu-devel] [PATCH v5 6/7] Add qemu_put_buffer_async, Orit Wasserman, 2013/03/22
- [Qemu-devel] [PATCH v5 7/7] Use qemu_put_buffer_async for guest memory pages, Orit Wasserman, 2013/03/22
- Re: [Qemu-devel] [PATCH v5 0/7] Migration: Remove copying of guest ram pages,
Eric Blake <=