[Xen-users] poor performance of hard disk in Windows DomU with Xen 4.0

[Flako <subforos@xxxxxxxxx>]

Hello
 I have a PC/Server with 2 Intel E6220 with 16GB ram, running Debian GNU / Linux 6.0 with kernel 2.6.32-5-xen-amd64.


 Adaptec controller has an ASR-2405 and am using the last module aacraid.ko (version 1.1-7 [28000]-ms)


 I have a significant drop in disk access performance when virtualizing Windows 2003 32Bit (Xen 4.0) and not if a topic module Xen aacraid.ko or incompatible with the module definition or bad domU


I agracere any suggestions of where else to look.


 Below I detail my confuracion



 /-- In the controller, I have 4 drives (2 RAID 1)


subsystem: Adaptec ASR-2405
 scsi0 : aacraid
 scsi 0:0:0:0: Direct-Access     Adaptec  R1sata           V1.0 PQ: 0 ANSI: 2
 scsi 0:0:1:0: Direct-Access     Adaptec  R1sas            V1.0 PQ: 0 ANSI: 2


 scsi 0:1:0:0: Direct-Access     WDC      WD5000AAKS-0     01.0 PQ: 1 ANSI: 5
 scsi 0:1:1:0: Direct-Access     WDC      WD5000AAKS-0     01.0 PQ: 1 ANSI: 5
 scsi 0:1:2:0: Direct-Access     SEAGATE  ST3300657SS      0006 PQ: 1 ANSI: 5


 scsi 0:1:3:0: Direct-Access     SEAGATE  ST3300657SS      0006 PQ: 1 ANSI: 5
\-- In the controller, I have 4 drives (2 RAID 1)


/--- The loaded modules are:
lsmod | grep ata
ata_generic             3239  0 
ata_piix               21124  0 
libata                133744  2 ata_generic,ata_piix
scsi_mod              126501  5 sg,sr_mod,sd_mod,libata,aacraid


\--- The loaded modules are:


 
The performance of rad 1 (with two SAS drives) with "hdparm-tT / dev / sdb" is:


/dev/sdb:
 Timing cached reads:   15192 MB in  1.99 seconds = 7636.45 MB/sec
 Timing buffered disk reads: 434 MB in  3.01 seconds = 144.02 MB/sec

In this link you can see the performnce the SAS disk partition, with the parameter phy.


 http://img96.imageshack.us/img96/7485/discosaswindowsdomu1.jpg

 In this link you can see that achieves performnce windows 2003 32bit host (native) of the same disk partition SAS


 http://img838.imageshack.us/img838/7610/discosaswindowshost.jpg

 The xm dmesg is in the link

 http://www.fileupyours.com/view/309484/xm_dmesg.txt



/---------The domU.cfg is:
kernel = '/usr/lib/xen-default/boot/hvmloader'
device_model = '/usr/lib64/xen/bin/qemu-dm'
builder = 'hvm'
maxmen = '9216'
memory = '9216'
shadow_memory = 87
acpi = 1


apic = 1
pae = 1
vcpus =16
videoram = 16

disk = [ 
        'phy:/dev/gv_db/vl2,ioemu:hda,w'       
        ,'phy:/dev/gv_db/vl1,ioemu:hdb,w'      
        ,'file:/mnt/domains/atreuco/disco3.img,ioemu:hdc,w'


        ,'phy:/dev/sdb2,ioemu:hdd,w'      
]
boot='c'
e1000=1
vif = ['type=ioemu, bridge=eth0' ]
usb =1
usbdevice = 'host:0925:01003'
\---------The domU.cfg is:


Thank you for reaching this far down ...

 Sorry for English, this is google:)

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