From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
To: Orit Wasserman <owasserm@redhat.com>
Cc: qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] slow xbzrle
Date: Thu, 25 Oct 2012 12:35:10 +0200 [thread overview]
Message-ID: <508915DE.5080509@profihost.ag> (raw)
In-Reply-To: <508909F4.8020100@redhat.com>
Am 25.10.2012 11:44, schrieb Orit Wasserman:
>> Is this known or is something wrong?
> My guess this workload migrates fine without XBZRLE so it is not the speed or downtime :).
> it could be that the cache size is too small resulting with a lot of cache misses which means
> XBZRLE makes things worse and just uses CPU to maintain the cache.
> Other option is that this workload changes the pages too much which can result with a lot of over flows
> which result in XBZRLE to waste CPU scanning the pages.
> As this is idle mysql my guess it the first scenario.
>
> Can you send the cache size, cache miss and overflow (from 'info migrate')?
Example got from a log file (it's the info from info migrate just in
another format):
migration xbzrle
cachesize: 1073741824
transferred 0
pages 0
cachemiss 1315374
overflow 0
Stefan
next prev parent reply other threads:[~2012-10-25 10:35 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-25 8:12 [Qemu-devel] slow xbzrle Stefan Priebe - Profihost AG
2012-10-25 9:44 ` Orit Wasserman
2012-10-25 10:35 ` Stefan Priebe - Profihost AG [this message]
2012-10-25 11:39 ` Orit Wasserman
2012-10-25 12:18 ` Stefan Priebe - Profihost AG
2012-10-25 13:15 ` Orit Wasserman
2012-10-25 20:45 ` Stefan Priebe
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