Re: [Qemu-devel] [PATCH v5 0/7] Migration: Remove copying of guest ram pages

[Eric Blake <eblake@redhat.com>]

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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 <eblake@redhat.com>

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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