[Users] Abysmal network performance inside hypervisor node

[Markus Stockhausen]

Hello,

we tried to migrate our first VM into the OVirt cluster. Lacking a separate
host for that task we simply jumped onto on of our FC19 OVirt nodes and
installed the virt-v2v packages. Converting speed ESX->NFS is less than 
10 MB/sec. OUCH!

To make sure we have no problems in our environment we reinstalled FC19 
on the node and made a direct NFS test: 450MB/sec read speed 

Inserting node into OVirt cluster once again we are down to 15MB/sec

Could someone clarify which kind of throtteling is activated for the Host
and if that might be an issue for the VMS.

Attached a short log:

Before Ovirt Install:

[root at colovn01 _ISOs]# date
Mi 11. Dez 08:33:53 CET 2013
[root at colovn01 _ISOs]# pwd
/mnt/_von_nas2/_ISOs
[root at colovn01 _ISOs]# mount | grep "mnt "
10.10.30.251:/var/nas1 on /mnt type nfs4 (rw,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=10.10.30.1,local_lock=none,addr=10.10.30.251)
[root at colovn01 _ISOs]# echo 3 >  /proc/sys/vm/drop_caches
[root at colovn01 _ISOs]# dd if=SLES-10-SP2-DVD-x86_64-GM-DVD1.iso of=/dev/null
5480236+0 Datensätze ein
5480236+0 Datensätze aus
2805880832 Bytes (2,8 GB) kopiert, 6,13422 s, 457 MB/s

After OVirt Install (test done twice to ensure NFS server cache is hot):

[root at colovn01 _ISOs]# date
Mi 11. Dez 11:33:53 CET 2013
[root at colovn01 _ISOs]# pwd
/mnt/_von_nas2/_ISOs
[root at colovn01 _ISOs]# mount | grep "mnt "
10.10.30.251:/var/nas1
 on /mnt type nfs4 
(rw,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=10.10.30.1,local_lock=none,addr=10.10.30.251)
[root at colovn01 _ISOs]# echo 3 >  /proc/sys/vm/drop_caches
[root at colovn01 _ISOs]# dd if=SLES-10-SP2-DVD-x86_64-GM-DVD1.iso of=/dev/null
5480236+0 Datensätze ein
5480236+0 Datensätze aus
2805880832 Bytes (2,8 GB) kopiert, 192,587 s, 14,6 MB/s
[root at colovn01 _ISOs]# echo 3 >  /proc/sys/vm/drop_caches
[root at colovn01 _ISOs]# dd if=SLES-10-SP2-DVD-x86_64-GM-DVD1.iso of=/dev/null
5480236+0 Datensätze ein
5480236+0 Datensätze aus
2805880832 Bytes (2,8 GB) kopiert, 193,131 s, 14,5 MB/s

Markus
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: InterScan_Disclaimer.txt
URL: <http://lists.ovirt.org/pipermail/users/attachments/20131211/d52e4dbb/attachment-0001.txt>