Re: [ kvm-Bugs-1802227 ] network speed

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Dong, Eddie wrote:
> kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org wrote:
>   
>> Bugs item #1802227, was opened at 2007-09-25 23:07
>> Message generated for change (Tracker Item Submitted) made by Item
>> Submitter You can respond by visiting:
>> https://sourceforge.net/tracker/?func=detail&atid=893831&aid=18
>> 02227&group_id=180599 
>>
>> Please note that this message will contain a full copy of the comment
>> thread, including the initial issue submission, for this request,
>> not just the latest update.
>> Category: None
>> Group: None
>> Status: Open
>> Resolution: None
>> Priority: 5
>> Private: No
>> Submitted By: xeb (xebd)
>> Assigned to: Nobody/Anonymous (nobody)
>> Summary: network speed
>>
>> Initial Comment:
>> Hello.
>>
>> Host:Linux 2.6.22-gentoo-r2 #2 SMP Fri Aug 3 07:01:46 MSD 2007 x86_64
>> AMD Athlon(tm) 64 X2 Dual Core Processor 5600+ AuthenticAMD
>> GNU/Linux,Gentoo, kvm-44
>>
>> Guest:Linux 2.6.22-hardened-r4
>>
>> I have measured network speed host<->guest and it is 200-400 KB/s.
>> Is so low speed proper for kvm ?
>>
>>
>>     
>
> I did a try on my box, but I get consistant scp performance of 1.5MB/s 
> w/ or w/o -no-kvm-irqchip. My platform is old, but host is 2.6.23 from
> kvm.git some time ago. 
> In the meantime, we do see issues in some configuration, while 
> didn't find the common point yet.
>
> Is this due to host linux version difference? Stranger ... Any new
> finding?
>   

hmm, if the host doesn't have hrtimers you can get better timing in
userspace (using rtc) that in the kernel.  However better timing
shouldn't lead to better networking performance.


-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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