[PVE-User] Bad IO Performance in "old" Debian Linux VMs

[Gilberto Nunes]

I suppose yes since very old kernel has problems with oldest virtio drivers

Em 26 de fev de 2017 06:50, "Ml Ml" <mliebherr99 at googlemail.com> escreveu:

> Hello List,
>
> i am running Proxmox version 4.4 on a 3 Node Full-Meshed Cluster with Ceph.
>
> Everythink works greate, except of the IO Performance on VMs which are
> Debian 5.
> In this Debian 5 VM i run a 2.6.32-bpo.5-amd64 Kernel with virtio and
> default cache
>
> I only get about a write speed of about 35MB/sec.
>
> With Debian 8 and 3.16.0-4-amd64 Kernel i get about 130MB/sec (which
> is the physical limit).
> (also using virtio - default cache)
>
> Is this performance drop with that older Kernel/Dist normal?
>
> If i have a look at dstat whilest doing my IO Test (on Debian 8 and
> Kernel 3.12)  i can see much more performance going on the network
> interfaces and disk.
>
> Therefore a hardware bottle neck can not be the reason for the bad
> performance on Debian 5 and Kernel 2.6.32.
>
> Any ideas (other than Updating from Debian5 to Debian8)?
>
> Thanks,
> Mario
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