Re: network performance drop heavily in xen 4.0 release

[yingbin wang <yingbin.wangyb@gmail.com>]

sorry, I forgot to report the performance of xen4.0+kernel2.6.18.8.

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 2.6.18.8:
  1. Our storage application is base on NBD, which will goto deadlock
on 2.6.18.8 when nbd-client and nbd-server are deployed on the same
server.
  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?

Cheers,
wyb

2010/4/16 Keir Fraser <keir.fraser@eu.citrix.com>:
> On 15/04/2010 17:39, "yingbin wang" <yingbin.wangyb@gmail.com> 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
>
>
>