[Xen-devel] Interrupt levels

[Nicholas Lee <nic-lists@xxxxxxxxxxxxxx>]

I'm tracking performance on the machine I installed yesterday.

mutt running on one Xen instance, accessing via imap to another
instance, accessing via nfs the maildir in another instances, seems
little laggy when moving up and down the message index list.

Network latency seems low < 30ms on average.

So I was tracking vmstat.

On the mutt instances is seems reasonable:

[nic@shell:~] vmstat 3
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 0  0      0 144464      4 127748    0    0     0     0   36     6  0  0 100  0
 0  0      0 144464      4 127748    0    0     0     0   87    67  1  0 99  0
 0  0      0 144464      4 127748    0    0     0     0   90    83  0  0 100  0
 0  0      0 144464      4 127748    0    0     0     0   27    14  0  0 100  0
 0  0      0 144464      4 127748    0    0     0     0   10     7  0  0 100  0
 0  0      0 144400      4 127748    0    0     0    19   77    56  0  0 100  0


However on the dom0 instance (which doesn't run any of the above
services, just the bridge) is seems very high:

nic@stateless:~$ vmstat 3
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 0  0     12  10640     40  31168    0    0    17    25   94    19  0  1 99  0
 0  0     12  10576     40  31168    0    0     0    17 170616    16  0  0 100  0
 0  0     12  10616     40  31168    0    0     0     0 171948    10  0  0 100  0
 0  0     12  10680     40  31168    0    0     0     0 171134    10  0  0 100  0
 0  0     12  10680     40  31168    0    0     0     3 169175    11  0  0 100  0
 0  0     12  10680     40  31168    0    0     0    15 173097    20  0  0 100  0


Is this level of interrupts reasonable? 


This currently a UP Xen 2.8 machine with 5 domX instances running
without a large amount of load.



Nicholas


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