search for: iothread

The docs[1] say: - The optional iothread attribute assigns the disk to an IOThread as defined by the range for the domain iothreads value. Multiple disks may be assigned to the same IOThread and are numbered from 1 to the domain iothreads value. Available for a disk device target configured to use "virtio" bus and "pc...

On Thu, Jan 17, 2019 at 4:35 PM Cole Robinson <crobinso@redhat.com> wrote: > > On 01/17/2019 05:58 AM, Igor Gnatenko wrote: > > Hello, > > > > is there any way of specifying iothreads via virt-install command? > > > > I've tried appending ",iothread='1'" but that didn't work. > > > > Thanks in advance! > > > > No unfortunately it's not wired up in virt-install. It's fairly easy to > patch+extend the comman...

On Wed, Nov 04, 2020 at 05:48:40PM +0200, Nir Soffer wrote: > The docs[1] say: > > - The optional iothread attribute assigns the disk to an IOThread as defined by > the range for the domain iothreads value. Multiple disks may be assigned to > the same IOThread and are numbered from 1 to the domain iothreads value. > Available for a disk device target configured to use "virtio" b...

Hello, is there any way of specifying iothreads via virt-install command? I've tried appending ",iothread='1'" but that didn't work. Thanks in advance! -- -Igor Gnatenko

...lator/mount/fuse.so[0x2b55b18d88ff] /lib64/libpthread.so.0[0x3a67606367] /lib64/libc.so.6(clone+0x6d)[0x3a66ad2f7d] --------- Here's the client configuration: volume client-stripe-1 type protocol/client option transport-type ib-verbs option remote-host gluster1 option remote-subvolume iothreads end-volume volume client-stripe-2 type protocol/client option transport-type ib-verbs option remote-host gluster2 option remote-subvolume iothreads end-volume volume client-stripe-3 type protocol/client option transport-type ib-verbs option remote-host gluster3 option remote-subv...

On Wed, Nov 04, 2020 at 05:48:40PM +0200, Nir Soffer wrote: > The docs[1] say: > > - The optional iothread attribute assigns the disk to an IOThread as defined by > the range for the domain iothreads value. Multiple disks may be assigned to > the same IOThread and are numbered from 1 to the domain iothreads value. > Available for a disk device target configured to use "virtio" b...

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Can somebody knows how to enable virtio-scsi-data-plane in libvirt for specific domain? I know that i need to replace "-device virtio-scsi-pci" with "-object iothread,id=io1 -device virtio-scsi-pci,iothread=io1" in qemu, but how can i do this in libvirt? -- Vasiliy Tolstov, e-mail: v.tolstov@selfip.ru

...wrote: > For virtio-blk, I don't think it is always better to take more queues, and > we need to leverage below things in host side: > > - host storage top performance, generally it reaches that with more > than 1 jobs with libaio(suppose it is N, so basically we can use N > iothread per device in qemu to try to get top performance) > > - iothreads' loading(if iothreads are at full loading, increasing > queues doesn't help at all) > > In my test, I only use the current per-dev iothread(x-dataplane) > in qemu to handle 2 vqs' notification and prec...

...wrote: > For virtio-blk, I don't think it is always better to take more queues, and > we need to leverage below things in host side: > > - host storage top performance, generally it reaches that with more > than 1 jobs with libaio(suppose it is N, so basically we can use N > iothread per device in qemu to try to get top performance) > > - iothreads' loading(if iothreads are at full loading, increasing > queues doesn't help at all) > > In my test, I only use the current per-dev iothread(x-dataplane) > in qemu to handle 2 vqs' notification and prec...

On 01/17/2019 05:58 AM, Igor Gnatenko wrote: > Hello, > > is there any way of specifying iothreads via virt-install command? > > I've tried appending ",iothread='1'" but that didn't work. > > Thanks in advance! > No unfortunately it's not wired up in virt-install. It's fairly easy to patch+extend the command line if you're interested, th...

..." nodeset="1"/> ... </numatune> This will ensure also the guest memory pinning. But wait, there is more. In your later e-mails you mention slow disk I/O. This might be caused by various variables but the most obvious one in this case is qemu I/O loop, I'd say. Without iothreads qemu has only one I/O loop and thus if your guest issues writes from all 32 cores at once this loop is unable to handle it (performance wise) and therefore the performance drop. You can try enabling iothreads: https://libvirt.org/formatdomain.html#elementsIOThreadsAllocation This is a qemu featu...

...r1/stripe end-volume volume posix-distribute type storage/posix option directory /export/gluster1/distribute end-volume volume locks type features/locks subvolumes posix-stripe end-volume volume locks-dist type features/locks subvolumes posix-distribute end-volume volume iothreads type performance/io-threads option thread-count 16 subvolumes locks end-volume volume iothreads-dist type performance/io-threads option thread-count 16 subvolumes locks-dist end-volume volume server type protocol/server option transport-type ib-verbs option auth.addr.iothreads....

Il 17/06/2014 18:00, Ming Lei ha scritto: >> > If you want to do queue steering based on the guest VCPU number, the number >> > of queues must be = to the number of VCPUs shouldn't it? >> > >> > I tried using a divisor of the number of VCPUs, but couldn't get the block >> > layer to deliver interrupts to the right VCPU. > For blk-mq's

Il 17/06/2014 18:00, Ming Lei ha scritto: >> > If you want to do queue steering based on the guest VCPU number, the number >> > of queues must be = to the number of VCPUs shouldn't it? >> > >> > I tried using a divisor of the number of VCPUs, but couldn't get the block >> > layer to deliver interrupts to the right VCPU. > For blk-mq's

2015-11-19 16:09 GMT+03:00 John Ferlan <jferlan@redhat.com>: > Check out virsh iothread{info|pin|add|del} and of course the > corresponding virDomain{Add|Pin|Del}IOThread and virDomainGetIOThreadInfo. Yes, thanks! Does in near feature libvirt devs integrate this ability to domain format? As i understand all qemu stable features supported by libvirt. And data plane for virtio-blk...

...lso pauses in writes but it finishes, speed is reduced though. On 1-NUMA node, with the same test, I can see steady writes from the very beginning to the very end at roughly the same speed. Maybe it could be related to the fact, that NVME is PCI device that is linked to one NUMA node only? As of iothreads, I have only 1 disk (the vde) that is exposed to high i/o load, so I believe more I/O threads is not applicable here. If I understand correctly, I cannot set more iothreads to a single device.. And it does not seem to be iothreads linked as the same scenario in 1-NUMA configuration works OK (I mea...

...pare, which requires serialization, and virtqueue_notify, which does not. Repurpose the return values to indicate whether the vq should be notified. This fixes a lock contention with qemu host. When the guest calls vibad rtqueue_notify, the qemu vcpu thread exits the guest and waits for the qemu iothread to perform the MMIO. If the qemu iothread is still processing the prior buffer, and if the prior buffer is cheap to GPU, the iothread will go ahead and generate an IRQ for the guest. A worker thread in the guest will call virtio_gpu_dequeue_ctrl_func. If virtqueue_notify was called with the vq l...

...pare, which requires serialization, and virtqueue_notify, which does not. Repurpose the return values to indicate whether the vq should be notified. This fixes a lock contention with qemu host. When the guest calls vibad rtqueue_notify, the qemu vcpu thread exits the guest and waits for the qemu iothread to perform the MMIO. If the qemu iothread is still processing the prior buffer, and if the prior buffer is cheap to GPU, the iothread will go ahead and generate an IRQ for the guest. A worker thread in the guest will call virtio_gpu_dequeue_ctrl_func. If virtqueue_notify was called with the vq l...

...beginning to the very end at roughly the same speed. > > Maybe it could be related to the fact, that NVME is PCI device that is linked > to one NUMA node only? Can be. I don't know qemu internals that much to know if its capable of doing zero copy disk writes. > > > As of iothreads, I have only 1 disk (the vde) that is exposed to high i/o > load, so I believe more I/O threads is not applicable here. If I understand > correctly, I cannot set more iothreads to a single device.. And it does not > seem to be iothreads linked as the same scenario in 1-NUMA configuration...