Re: How to turn off disk elevator

2016-07-13 Thread lists
> I had done lots of performance tests in the past and the more VMs you are > running on a server, the more you will see latencies in disk IO. I found out > that turning off the schedulers and also setting swappiness to a very low > value, brings back performance. To some extent.. where you start

Re: How to turn off disk elevator

2016-07-13 Thread Reyk Floeter
> On 13.07.2016, at 13:07, Mike Belopuhov wrote: > > On Wed, Jul 13, 2016 at 12:48 +0200, Peter N. M. Hansteen wrote: >> On Wed, Jul 13, 2016 at 12:39:14PM +0200, Christian Rner wrote: Hello, you should use virtio drivers for the disk in KVM. >>> >>> I already use

Re: How to turn off disk elevator

2016-07-13 Thread Christian Rößner
> Am 13.07.2016 um 12:48 schrieb Peter N. M. Hansteen : > > On Wed, Jul 13, 2016 at 12:39:14PM +0200, Christian Rner wrote: >>> Hello, you should use virtio drivers for the disk in KVM. >> >> I already use virtio ;-) But there is no need for the BSD kernel to do further >>

Re: How to turn off disk elevator

2016-07-13 Thread Christian Rößner
> Am 13.07.2016 um 13:07 schrieb Mike Belopuhov : > > On Wed, Jul 13, 2016 at 12:48 +0200, Peter N. M. Hansteen wrote: >> On Wed, Jul 13, 2016 at 12:39:14PM +0200, Christian Rner wrote: Hello, you should use virtio drivers for the disk in KVM. >>> >>> I already use

Re: How to turn off disk elevator

2016-07-13 Thread Mike Belopuhov
On Wed, Jul 13, 2016 at 12:48 +0200, Peter N. M. Hansteen wrote: > On Wed, Jul 13, 2016 at 12:39:14PM +0200, Christian Rner wrote: > > > Hello, you should use virtio drivers for the disk in KVM. > > > > I already use virtio ;-) But there is no need for the BSD kernel to do > > further > >

Re: How to turn off disk elevator

2016-07-13 Thread Otto Moerbeek
On Wed, Jul 13, 2016 at 11:48:31AM +0200, Christian Rner wrote: > Hi, > > I am relatively new to OpenBSD. I have installed my first virtualized KVM > guest and I look for a way to completely turn off the disk elevator, as the > guest is running on a server that uses Gentoo Linux as OS on the

Re: How to turn off disk elevator

2016-07-13 Thread Peter N. M. Hansteen
On Wed, Jul 13, 2016 at 12:39:14PM +0200, Christian Rner wrote: > > Hello, you should use virtio drivers for the disk in KVM. > > I already use virtio ;-) But there is no need for the BSD kernel to do further > scheduling. I'm not at all there is a knob to twiddle here, but if there is, will

Re: How to turn off disk elevator

2016-07-13 Thread lists
> Hello, you should use virtio drivers for the disk in KVM. Wasn't virtio(4) the default anyway at least on majority of KVM providers?

Re: How to turn off disk elevator

2016-07-13 Thread Christian Rößner
> Am 13.07.2016 um 12:22 schrieb Solène : > > Le 2016-07-13 11:48, Christian Rößner a écrit : >> Hi, >> I am relatively new to OpenBSD. I have installed my first virtualized KVM >> guest and I look for a way to completely turn off the disk elevator, as the >> guest is running on a

Re: How to turn off disk elevator

2016-07-13 Thread Solène
Le 2016-07-13 11:48, Christian Rößner a écrit : Hi, I am relatively new to OpenBSD. I have installed my first virtualized KVM guest and I look for a way to completely turn off the disk elevator, as the guest is running on a server that uses Gentoo Linux as OS on the physical server (having

Re: How to turn off disk elevator

2016-07-13 Thread lists
One reliable solution, as usual, the simplest: run OpenBSD bare metal..