...@profihost.ag
Cc: pve-de...@pve.proxmox.com
Envoyé: Lundi 12 Novembre 2012 15:26:36
Objet: Re: [pve-devel] less cores more iops / speed
Maybe some tracing on kvm process could give us clues to find where the cpu is
used ?
Also another idea, can you try with auth supported=none ? maybe they are some
12 Novembre 2012 15:26:36
Objet: Re: [pve-devel] less cores more iops / speed
Maybe some tracing on kvm process could give us clues to find where
the cpu is used ?
Also another idea, can you try with auth supported=none ? maybe they
are some overhead with ceph authenfication ?
- Mail
Hi Josh,
For the client side you'd these settings to disable all debug logging:
...
Thanks!
Stefan
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Am 08.11.2012 16:53, schrieb Alexandre DERUMIER:
So it is a problem of KVM which let's the processes jump between cores a
lot.
maybe numad from redhat can help ?
http://fedoraproject.org/wiki/Features/numad
It's try to keep process on same numa node and I think it's also doing some
dynamic
Am 08.11.2012 01:59, schrieb Mark Nelson:
There's also the context switching overhead. It'd be interesting to
know how much the writer processes were shifting around on cores.
What do you mean by that? I'm talking about the KVM guest not about the
ceph nodes.
Stefan, what tool were you
...@profihost.ag
À: Mark Nelson mark.nel...@inktank.com
Cc: Joao Eduardo Luis joao.l...@inktank.com, ceph-devel@vger.kernel.org
Envoyé: Jeudi 8 Novembre 2012 09:45:17
Objet: Re: less cores more iops / speed
Am 08.11.2012 01:59, schrieb Mark Nelson:
There's also the context switching overhead. It'd
:45:17
Objet: Re: less cores more iops / speed
Am 08.11.2012 01:59, schrieb Mark Nelson:
There's also the context switching overhead. It'd be interesting to
know how much the writer processes were shifting around on cores.
What do you mean by that? I'm talking about the KVM guest not about
@vger.kernel.org,
Mark Nelson mark.nel...@inktank.com
Envoyé: Jeudi 8 Novembre 2012 10:02:23
Objet: Re: less cores more iops / speed
Am 08.11.2012 09:58, schrieb Alexandre DERUMIER:
What do you mean by that? I'm talking about the KVM guest not about the
ceph nodes.
Do you have tried
Am 08.11.2012 10:05, schrieb Alexandre DERUMIER:
Do you have tried to compare virtio-blk and virtio-scsi ?
How to change? Right now i'm using the PVE defaults = scsi-hd.
(virtio-blk is classic virtio ;)
Do you have tried directly from the host with the rbd kernel module ?
No don't know how
On 11/08/2012 02:45 AM, Stefan Priebe - Profihost AG wrote:
Am 08.11.2012 01:59, schrieb Mark Nelson:
There's also the context switching overhead. It'd be interesting to
know how much the writer processes were shifting around on cores.
What do you mean by that? I'm talking about the KVM guest
Am 08.11.2012 14:19, schrieb Mark Nelson:
On 11/08/2012 02:45 AM, Stefan Priebe - Profihost AG wrote:
Am 08.11.2012 01:59, schrieb Mark Nelson:
There's also the context switching overhead. It'd be interesting to
know how much the writer processes were shifting around on cores.
What do you
Priebe - Profihost AG s.pri...@profihost.ag
À: Mark Nelson mark.nel...@inktank.com
Cc: Joao Eduardo Luis joao.l...@inktank.com, ceph-devel@vger.kernel.org
Envoyé: Jeudi 8 Novembre 2012 16:14:32
Objet: Re: less cores more iops / speed
Am 08.11.2012 14:19, schrieb Mark Nelson:
On 11/08/2012 02
@vger.kernel.org
Envoyé: Jeudi 8 Novembre 2012 16:14:32
Objet: Re: less cores more iops / speed
Am 08.11.2012 14:19, schrieb Mark Nelson:
On 11/08/2012 02:45 AM, Stefan Priebe - Profihost AG wrote:
Am 08.11.2012 01:59, schrieb Mark Nelson:
There's also the context switching overhead. It'd
Hello again,
I've noticed something really interesting.
I get 5000 iops / VM for rand. 4k writes while assigning 4 cores on a
2.5 Ghz Xeon.
When i move this VM to another kvm host with 3.6Ghz i get 8000 iops
(still 8 cores) when i then LOWER the assigned cores from 8 to 4 i get
14.500
On 11/07/2012 10:02 PM, Stefan Priebe wrote:
Hello again,
I've noticed something really interesting.
I get 5000 iops / VM for rand. 4k writes while assigning 4 cores on a
2.5 Ghz Xeon.
When i move this VM to another kvm host with 3.6Ghz i get 8000 iops
(still 8 cores) when i then LOWER
On 11/07/2012 06:00 PM, Joao Eduardo Luis wrote:
On 11/07/2012 10:02 PM, Stefan Priebe wrote:
Hello again,
I've noticed something really interesting.
I get 5000 iops / VM for rand. 4k writes while assigning 4 cores on a
2.5 Ghz Xeon.
When i move this VM to another kvm host with 3.6Ghz i get
On 11/07/2012 06:00 PM, Joao Eduardo Luis wrote:
On 11/07/2012 10:02 PM, Stefan Priebe wrote:
Hello again,
I've noticed something really interesting.
I get 5000 iops / VM for rand. 4k writes while assigning 4 cores on a
2.5 Ghz Xeon.
When i move this VM to another kvm host with 3.6Ghz i get
I've noticed something really interesting.
I get 5000 iops / VM for rand. 4k writes while assigning 4 cores on a
2.5 Ghz Xeon.
When i move this VM to another kvm host with 3.6Ghz i get 8000 iops
(still 8
cores) when i then LOWER the assigned cores from 8 to 4 i get
14.500 iops.
Am 08.11.2012 um 06:42 schrieb Dietmar Maurer diet...@proxmox.com:
I've noticed something really interesting.
I get 5000 iops / VM for rand. 4k writes while assigning 4 cores on a
2.5 Ghz Xeon.
When i move this VM to another kvm host with 3.6Ghz i get 8000 iops (still 8
cores) when i
Why is vhost net driver involved here at all? Kvm guest only uses ssh here.
I though you are testing things (rdb) which depends on KVM network speed?
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Am 08.11.2012 um 06:49 schrieb Dietmar Maurer diet...@proxmox.com:
I've noticed something really interesting.
I get 5000 iops / VM for rand. 4k writes while assigning 4 cores on a
2.5 Ghz Xeon.
When i move this VM to another kvm host with 3.6Ghz i get 8000 iops
(still 8
cores) when i
Am 08.11.2012 um 06:54 schrieb Dietmar Maurer diet...@proxmox.com:
Why is vhost net driver involved here at all? Kvm guest only uses ssh here.
I though you are testing things (rdb) which depends on KVM network speed?
Kvm process uses librbd and both are running on host not in guest.
Stefan
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