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

[Tomasz Chmielewski]

Dietmar Maurer wrote:
> There was small bug in the debian control file of qemu-server_1.1-7_amd64.deb (still contains version 1.1-6)
> 
> Please download again and install with 'dpkg' if you see problems.

FYI - I still see a KVM guest which was makes lots of IO getting slow after a few days (best seen with long ping replies it sends):

64 bytes from 192.168.111.173: icmp_seq=96 ttl=63 time=1.60 ms
64 bytes from 192.168.111.173: icmp_seq=97 ttl=63 time=1.90 ms
64 bytes from 192.168.111.173: icmp_seq=98 ttl=63 time=563 ms
64 bytes from 192.168.111.173: icmp_seq=99 ttl=63 time=1.64 ms
64 bytes from 192.168.111.173: icmp_seq=100 ttl=63 time=998 ms
64 bytes from 192.168.111.173: icmp_seq=101 ttl=63 time=1.56 ms


Although it is an order of magnitude longer until it gets into that state now.

No idea how to debug it farther, but for now, I'd recommend using e1000 for guests making extensive CPU/IO usage.


pxmx1:/etc/qemu-server# cat /proc/fairsched
Version: 2.6 debug
      veid         id     parent weight  rate tasks   run cpus flg ready            start_tag                value                delay
         0          0          0    500     0   130     1    4  ..     1                    0                    0                    0
         0 2147483647          0    500     0   130     1    4  ..     1                    0                    0                    0

pxmx1:/etc/qemu-server# cat /proc/fairsched2
Version: 2.7 debug
        id weight  rate   run cpus flg ready            start_tag                value                delay
2147483647    500     0     1    4  ..     1                    0                    0                    0


-- 
Tomasz Chmielewski
http://wpkg.org