Bad performance of virtual disk driver

[Matthias Scheler <tron%zhadum.de@localhost>]

        Hello,

I've using the following setup:

Hypervisor:     Xen 2.0.5
dom0:           Linux 2.6.10
domU:           NetBSD 3.0_BETA (sources from 2005-04-28)

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/