[PVE-User] "fairsched" still in use with virtio guests in 1.4 (and slowness happen)

Tomasz Chmielewski mangoo at wpkg.org
Thu Oct 22 11:52:39 CEST 2009


"fairsched" was supposed to be not used with guests using virtio, as it 
causes guest "slowness".

This is partially the case - "-cpuunits" option is no longer applied.

Today, to some surprise, I noticed that some of my virtio guests are 
again slow, with the usual symptoms (1000ms replies to pings etc.).

Looking at /proc/fairsched and /proc/fairsched2 shows that if 
"-cpuuints" option is not given, a default weight of 500 is still 
applied to the guests.
Which is not good, as it causes the "slowness".

Tomasz Chmielewski

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