[pve-devel] new cache benchmark results
Alexandre DERUMIER
aderumier at odiso.com
Thu Nov 8 21:58:24 CET 2012
Hi Martin,
#mkfs.xfs /dev/vdb
#mount /dev/vdb /mnt/ (default xfs options)
#fio --filename=/mnt/test1 --rw=randwrite --bs=4k --iodepth=40 --size=10000M --groupe_reporting --name=file1 --ioengine=libaio
I take the iops result. (this is an average)
I didn't have tested lvm, maybe it could be great to test it over local storage and over iscsi storage.
Alexandre
----- Mail original -----
De: "Martin Maurer" <martin at proxmox.com>
À: pve-devel at pve.proxmox.com
Envoyé: Jeudi 8 Novembre 2012 21:05:23
Objet: Re: [pve-devel] new cache benchmark results
Thx for testing! What command do you run exactly to get this benchmark number?
I just want to make sure that I can compare your results with mine in the right way.
Martin
> -----Original Message-----
> From: pve-devel-bounces at pve.proxmox.com [mailto:pve-devel-
> bounces at pve.proxmox.com] On Behalf Of Alexandre DERUMIER
> Sent: Donnerstag, 08. November 2012 17:09
> To: pve-devel at pve.proxmox.com
> Subject: [pve-devel] new cache benchmark results
>
> netapp nfs: raw file
> ---------------
>
> default(no drive cache option) : 8000
> none: 13000
> writeback = 8000
>
>
>
> netapp nfs: qcow2 file
> ---------------
>
> default(no drive cache option) : 5000
> none: 12000
> writeback = 5000
>
>
> local raid controller (512MB CACHE with battery): raw file
> -------------------------------------------------
> default(no drive cache option): 10000
> cache=none : 4000
> cache=writeback : 10000
>
>
> local raid controller (512MB CACHE with battery): qcow2 file
> -------------------------------------------------
> default(no drive cache option): 9000
> cache=none : 6000
> cache=writeback : 9000
>
>
>
>
> So writeback seem to be faster on local storage, but slower on network
> storage.
>
> Note : with shared storage, with writeback, I generally see big spike (faster
> than cache=none), but after big slowdown (near zero) during 5-10s.
> So I think this is when the host need to flush the datas, it add more
> overhead. (maybe network latency have an impact...)
>
>
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