port-xen: Bad performance of virtual disk driver

Subject: Bad performance of virtual disk driver
To: None <port-xen@NetBSD.org>
From: Matthias Scheler <tron@zhadum.de>
List: port-xen
Date: 05/03/2005 14:34:56

	Hello,
I've using the following setup:
Hypervisor:	Xen 2.0.5
dom0:		Linux 2.6.10
domU:		NetBSD 3.0_BETA (sources from 2005年04月28日)
The performace of the virtual disks is very bad ...
	# dd if=/dev/xbd1b of=/dev/null bs=1024k
	512+0 records in
	512+0 records out
	536870912 bytes transferred in 331.800 secs (1618055 bytes/sec)
... compared to the performance in the Linux dom0:
	# dd if=/dev/vg/matthias-1swap of=/dev/null bs=1024k
	512+0 records in
	512+0 records out
	536870912 bytes transferred in 15.469114 seconds (34705990 bytes/sec)
Has anybody else observered this problem?
	Kind regards
-- 
Matthias Scheler http://scheler.de/~matthias/