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Re: [Xen-devel] network performance drop heavily in xen 4.0 release

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] network performance drop heavily in xen 4.0 release
From: yingbin wang <yingbin.wangyb@xxxxxxxxx>
Date: Fri, 16 Apr 2010 12:24:12 +0800
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sorry, I forgot to report the performance of xen4.0+kernel2.6.18.8.

[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-16.3 sec  1.79 GBytes    941 Mbits/sec

This combination can only meet some of our needs.

the reason why we didn't use
  1. Our storage application is base on NBD, which will goto deadlock
on when nbd-client and nbd-server are deployed on the same
  2. Hard disk frequently offline

so we want to upgrade to kernel2.6.31.
we also try xen4.0+kernel2.6.31.12(gentoo-xen-kernel patch). the
performance is acceptable, but blktap2(support VHD) not work.
has anybody solve the problem in xen4.0+kernel2.6.31.13?


2010/4/16 Keir Fraser <keir.fraser@xxxxxxxxxxxxx>:
> On 15/04/2010 17:39, "yingbin wang" <yingbin.wangyb@xxxxxxxxx> wrote:
>>     I report a Bug !!!  We have just upgraded to
>> xen4.0+kernel2.6.31.13 recently.  however , fond that the network
>> performance drop heavily in dom0  (nearly Reduced by 2/3 vs
>> xen3.4.2+kernel2.6.18.8 ) .
> How does xen4.0+kernel2.6.18.8 perform? The regression is more likely in the
> dom0 kernel than Xen itself. And you don't *have* to upgrade both.
>  -- Keir

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