[pve-devel] new cache benchmark results

[Martin Maurer]

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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