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Re: [Qemu-devel] any known virtio-net regressions in Qemu 2.7?
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From: |
Stefan Priebe - Profihost AG |
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Subject: |
Re: [Qemu-devel] any known virtio-net regressions in Qemu 2.7? |
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Date: |
Fri, 16 Dec 2016 22:00:36 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 |
Am 15.12.2016 um 07:46 schrieb Alexandre DERUMIER:
> does rollbacking the kernel to previous version fix the problem ?
The culprit is the used tuned agent from Redhat
(https://github.com/redhat-performance/tuned). The used profile
virtual-host results in these problems. Stopping tuned or using another
profile like throughput-performance everything is fine again.
Geets,
Stefan
>
> i'm not sure if "perf" could give you some hints
> ----- Mail original -----
> De: "Stefan Priebe, Profihost AG" <address@hidden>
> À: "aderumier" <address@hidden>
> Cc: "qemu-devel" <address@hidden>
> Envoyé: Mercredi 14 Décembre 2016 21:36:23
> Objet: Re: [Qemu-devel] any known virtio-net regressions in Qemu 2.7?
>
> Am 14.12.2016 um 16:33 schrieb Alexandre DERUMIER:
>> Hi Stefan,
>>
>> do you have upgraded kernel ?
>
> Yes sure. But i'm out of ideas how to debug. Sometimes it gives me
> constant 80MB/s, sometimes 125 and sometimes only 6. While on the host
> the cards are not busy.
>
> Greets,
> Stefan
>
>>
>> maybe it could be related to vhost-net module too.
>>
>>
>> ----- Mail original -----
>> De: "Stefan Priebe, Profihost AG" <address@hidden>
>> À: "qemu-devel" <address@hidden>
>> Envoyé: Mercredi 14 Décembre 2016 16:04:08
>> Objet: [Qemu-devel] any known virtio-net regressions in Qemu 2.7?
>>
>> Hello,
>>
>> after upgrading a cluster OS, Qemu, ... i'm experiencing slow and
>> volatile network speeds inside my VMs.
>>
>> Currently I've no idea what causes this but it's related to the host
>> upgrades. Before i was running Qemu 2.6.2.
>>
>> I'm using virtio for the network cards.
>>
>> Greets,
>> Stefan
>>
>