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qm: IO thread: mention that setting can also help with hangs

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See https://bugzilla.kernel.org/show_bug.cgi?id=199727

Reported-by: Roland Kletzing <devzero@web.de>
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
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Fiona Ebner 2022-12-20 12:24:23 +01:00 committed by Thomas Lamprecht
parent 4c7a47cf0e
commit bcb4e590fb
1 changed files with 3 additions and 1 deletions
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qm.adoc
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@ -253,7 +253,9 @@ The option *IO Thread* can only be used when using a disk with the *VirtIO*
controller, or with the *SCSI* controller, when the emulated controller type is
*VirtIO SCSI single*. With *IO Thread* enabled, QEMU creates one I/O thread per
storage controller, rather than handling all I/O in the main event loop or vCPU
threads. This can increase performance, because of improved work distribution.
threads. This can increase performance, because of improved work distribution
and also avoid hangs under very I/O-intensive host workloads, because other
threads won't be blocked waiting for I/O.
[[qm_cpu]]