Re: [Users] VirtIO disk latency

2014-01-16 Thread Blaster
On Jan 9, 2014, at 3:16 AM, Markus Stockhausen wrote: > > We see a quite a heavy latency penalty using KVM VirtIO disks in comparison > to ESX. Doing one I/O onto disk inside a VM usually adds 370us of overhead in > the virtualisation layer. This has been tested with VirtIO-SCSI and windows > g

Re: [Users] VirtIO disk latency

2014-01-09 Thread Markus Stockhausen
> Von: sander.grendel...@gmail.com > Gesendet: Donnerstag, 9. Januar 2014 10:32 > An: Markus Stockhausen > Cc: users@ovirt.org > Betreff: Re: [Users] VirtIO disk latency > > On Thu, Jan 9, 2014 at 10:16 AM, Markus Stockhausen > wrote: > ... > > - access NFS in

Re: [Users] VirtIO disk latency

2014-01-09 Thread Sander Grendelman
On Thu, Jan 9, 2014 at 10:16 AM, Markus Stockhausen wrote: ... > - access NFS inside the hypervisor - 12.000 I/Os per second - or 83us latency > - access DISK inside ESX VM that resides on NFS - 8000 I/Os per second - or > 125us latency > - access DISK inside OVirt VM that resides on NFS - 2200 I

[Users] VirtIO disk latency

2014-01-09 Thread Markus Stockhausen
Hello, coming from the "low cost NFS storage thread" I will open a new one about a topic that might be interesting for others too. We see a quite a heavy latency penalty using KVM VirtIO disks in comparison to ESX. Doing one I/O onto disk inside a VM usually adds 370us of overhead in the virtuali