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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