Re: [Xen-users] poor IO performance with dom0 on centos7

[Christoph <mangel@xxxxxx>]

Am 2015-09-01 10:51, schrieb Roger Pau MonnÃ:
> Hello,
>
> El 01/09/15 a les 6.11, Christoph ha escrit:
>
> Is the performance in Dom0 as expected?
As far as I see, yes

> Can you paste the DomU configuration files?
sure:

cat /etc/xen/leviathan.cfg
name            = "leviathan"
kernel          = "/usr/lib/xen/boot/pv-grub-x86_64.gz"
extra           = "(hd0)/boot/grub/grub.conf"
vcpus           = 4
memory          = 3072
disk            = [ 
'phy:/dev/vg_lilith/lv_leviathan_root,xvda,w','phy:/dev/vg_lilith/lv_leviathan_swap,xvdb,w', 
'phy:/dev/vg_lilith/lv_leviathan_home,xvdc,w' ]
vif             = [ 
'bridge=xenbr5,mac=00:16:3E:05:31:60,script=vif-bridge','bridge=xenbr15,mac=00:16:3E:15:31:60,script=vif-bridge','bridge=xenbr2,mac=00:16:3E:02:31:60,script=vif-bridge', 
'bridge=xenbr4,mac=00:16:3E:04:31:60,script=vif-bridge', 
'bridge=xenbr14,mac=00:16:3E:14:31:60,script=vif-bridge' ]
on_poweroff     = 'destroy'
on_reboot       = 'restart'
on_crash        = 'restart'

> Are both network and disk slow, or only one of them? I would recommend
> using fio/iperf in order to figure out which one is the bottleneck, or
> if both are.
I think network in any case... the leviathan gets files from satan over 
nfs, uncompress them and write it again on nfs from satan...
--
------
Greetz

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