-----Message d'origine-----
De : xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] De la part de
DOGUET Emmanuel
Envoyé : mardi 24 février 2009 14:22
À : Fajar A. Nugraha
Cc : xen-users; Joris Dobbelsteen
Objet : RE: [Xen-users] Re: Xen Disk I/O performance vs
nativeperformance:Xen I/O is definitely super super super slow
I have made another test on another server (DL 380)
And same thing!
I'm always use this test :
dd if=/dev/zero of=TEST bs=4k count=1250000
(be careful with memory cache)
TEST WITH 2 RAID 5 (include system on RAID 5, 3x146G + 3x146G)
---------------------------------------------------------------
dom0: 1GO, 1CPU, 2 RAID 5
rootvg(c0d0p1): 4596207616 bytes (4.6 GB)
copied, 158.284 seconds, 29.0 MB/s
datavg(c0d1p1): 5120000000 bytes (5.1 GB)
copied, 155.414 seconds, 32.9 MB/s
domU: 512M, 1CPU on System LVM/RAID5 (rootvg)
5120000000 bytes (5.1 GB) copied, 576.923 seconds, 8.9 MB/s
domU: 512M, 1CPU on DATA LVM/RAID5 (datavg)
5120000000 bytes (5.1 GB) copied, 582.611 seconds, 8.8 MB/s
domU: 512M, 1 CPU on same RAID without LVM
5120000000 bytes (5.1 GB) copied, 808.957 seconds, 6.3 MB/s
TEST WITH RAID 0 (dom0 system on RAID 1)
---------------------------------------
dom0 1GO RAM 1CPU
on system (RAID1):
i3955544064 bytes (4.0 GB) copied, 57.4314 seconds, 68.9 MB/s
on direct HD (RAID 0 of cssiss), no LVM
5120000000 bytes (5.1 GB) copied, 62.5497 seconds, 81.9 MB/s
dom0 4GO RAM 4CPU
domU: 4GO, 4 CPU
on direct HD (RAID 0), no LVM.
5120000000 bytes (5.1 GB) copied, 51.2684 seconds, 99.9 MB/s
domU: 4GO, 4CPU same HD but ONE LVM on it
5120000000 bytes (5.1 GB) copied, 51.5937 seconds, 99.2 MB/s
TEST with only ONE RAID 5 (6 x 146G)
------------------------------------
dom0 : 1024MB - 1CPUI (RHEL 5.3)
5120000000 bytes (5.1 GB) copied, 231.113 seconds, 22.2 MB/s
512MB - 1 CPU
5120000000 bytes (5.1 GB) copied, 1039.42 seconds, 4.9 MB/s
512MB - 1 CPU - ONLY 1 VDB [LVM] (root, no swap)
(too slow ..stopped :P)
4035112960 bytes (4.0 GB) copied, 702.883 seconds, 5.7 MB/s
512MB - 1 CPU - On a file (root, no swap)
1822666752 bytes (1.8 GB) copied, 2753.91 seconds, 662 kB/s
4GB - 2 CPU
5120000000 bytes (5.1 GB) copied, 698.681 seconds, 7.3 MB/s
-----Message d'origine-----
De : Fajar A. Nugraha [mailto:fajar@xxxxxxxxx]
Envoyé : samedi 14 février 2009 06:23
À : DOGUET Emmanuel
Cc : xen-users
Objet : Re: [Xen-users] Re: Xen Disk I/O performance vs native
performance:Xen I/O is definitely super super super slow
2009/2/13 DOGUET Emmanuel <Emmanuel.DOGUET@xxxxxxxx>:
I have mount domU partition on dom0 for testing and it's OK.
But same partiton on domU side is slow.
Strange.
Strange indeed. At least that ruled-out hardware problems :)
Could try with a "simple" domU?
- 1 vcpu
- 512 M memory
- only one vbd
this should isolate whether or not the problem is on your particular
domU (e.g. some config parameter actually make domU slower).
Your config file should have only few lines, like this
memory = "512"
vcpus=1
disk = ['phy:/dev/rootvg/bdd-root,xvda1,w' ]
vif = [ "mac=00:22:64:A1:56:BF,bridge=xenbr0" ]
vfb =['type=vnc']
bootloader="/usr/bin/pygrub"
Regards,
Fajar
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