Re: less cores more iops / speed

[Stefan Priebe - Profihost AG <s.priebe@profihost.ag>]

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 to compare virtio-blk and virtio-scsi ?
How to change? Right now i'm using the PVE defaults => scsi-hd.

> Do you have tried directly from the host with the rbd kernel module ?
No don't know how to use ;-)

Stefan


> ----- Mail original -----
>
> De: "Stefan Priebe - Profihost AG" <s.priebe@profihost.ag>
> À: "Mark Nelson" <mark.nelson@inktank.com>
> Cc: "Joao Eduardo Luis" <joao.luis@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 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 using to do writes?
> as always: fio ;-)
>
> Stefan
>
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