Re: [Qemu-discuss] [problem]-starting a VM causes RT (latency) problem for application running on another VM

2016-07-27 Thread Yan Fridland
This is my mistake. I actually got confused because what I saw is a "swapper" process which apparently has nothing to do with SWAP, rather than being just an IDLE process in a system. It started running after the application crashed, so it’s a consequence and not the root cause. Besides what I s

Re: [Qemu-discuss] Using vhost scsi

2016-07-27 Thread Stefan Hajnoczi
On Tue, Jul 26, 2016 at 06:35:30PM +, Yehuda Yitschak wrote: > Thanks a lot for the detailed answer > > I managed to run virtio-scsi and i am benchmarking the performance > > just curios, does virtio-scsi deliver about the same performance as > vhost-scsi ? Both virtio-scsi and vhost-scsi

[Qemu-discuss] Understanding Qemu Block

2016-07-27 Thread Gadre Nayan
Hi, I have recently started working on QEMU and it seems a daunting task to say the least, hence I wanted some head-start. I have browsed the source but I still need to bring closer some dots so I can start working on some experimental changes. I will have to ask further questions based on my new

Re: [Qemu-discuss] Using vhost scsi

2016-07-27 Thread Michael S. Tsirkin
On Wed, Jul 27, 2016 at 09:34:25AM +0100, Stefan Hajnoczi wrote: > On Tue, Jul 26, 2016 at 06:35:30PM +, Yehuda Yitschak wrote: > > Thanks a lot for the detailed answer > > > > I managed to run virtio-scsi and i am benchmarking the performance > > > > just curios, does virtio-scsi deliver ab

Re: [Qemu-discuss] [problem]-starting a VM causes RT (latency) problem for application running on another VM

2016-07-27 Thread Yan Fridland
Suppose all the QEMU threads of both VMs run on separate CPUs (which should be guaranteed by the vcpu pinning in the XML), I am trying to think of a resource that can be shared between the 2 VMs. The only thing that comes into my mind is memory. I saw that the RAM allocation for the VMs is don

[Qemu-discuss] storage for qemu images

2016-07-27 Thread Patrick Dumais
Hi, I'm trying to figure out where is the best place to store qemu disk images. I am using qcow2 format on a raid1 built from 2 7200RPM hdd. I am considering moving the images on a ssd (not raid). The move to ssd would increase performances but the drawback is that I would not be on raid1 an

Re: [Qemu-discuss] storage for qemu images

2016-07-27 Thread Fam Zheng
On Wed, 07/27 15:32, Patrick Dumais wrote: > > Hi, I'm trying to figure out where is the best place to store qemu disk > images. > > I am using qcow2 format on a raid1 built from 2 7200RPM hdd. > I am considering moving the images on a ssd (not raid). The move to ssd > would increase performances