[ kvm-Bugs-1802227 ] network speed

[ kvm-Bugs-1802227 ] network speed

[SourceForge.net]

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=1802227&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 ?


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https://sourceforge.net/tracker/?func=detail&atid=893831&aid=1802227&group_id=180599

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Re: [ kvm-Bugs-1802227 ] network speed

[Dong, Eddie]

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?
Eddie

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Re: [ kvm-Bugs-1802227 ] network speed

[Avi Kivity]

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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