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Re: Xen Dom0 vs. DomU disk I/O

Am Donnerstag, 22. November 2012, 07:54:34 schrieben Sie:
> I have done the testing like this:

both SAS II with 512 MB cache (COMPAQ Smart Array) on a HP DL 360 G6 - LVM

NetBSD is a bit "faster" in this test in my case.

100 MB
=====NetBSD DomU (log,noatime,rw)
dd if=/dev/zero of=/var/tmp/test.dd bs24k count0
100+0 records in
100+0 records out
104857600 bytes transferred in 0.280 secs (374491428 bytes/sec)

Gentoo Linux DomU (ext4,noatime,rw)
dd if=/dev/zero of=/tmp/test.dd bs24k count0
100+0 Datensätze ein
100+0 Datensätze aus
104857600 Bytes (105 MB) kopiert, 0,329664 s, 318 MB/s

1 GB
NetBSD (log,noatime,rw)
dd if=/dev/zero of=/var/tmp/test.dd bs24k count00
1000+0 records in
1000+0 records out
1048576000 bytes transferred in 9.799 secs (107008470 bytes/sec)

Gentoo Linux (ext4,noatime,rw)
dd if=/dev/zero of=/tmp/test.dd bs24k count00
1000+0 Datensätze ein
1000+0 Datensätze aus
1048576000 Bytes (1,0 GB) kopiert, 14,0278 s, 74,7 MB/s

But IO goes down significantly on both OS if i use file based virtual disks on
DomUs as usual.


 Niels Dettenbach
 Syndicat IT & Internet

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