[Xen-devel] Poor write performance with physical disk on DomainU freebsd

[lepton <ytht.net@xxxxxxxxx>]

I get freebsd xen port from http://www.fsmware.com/xenofreebsd/5.3/

After I get it to work, I think using a loop file is slow. So I decided to
move all files to a physical disk.
I changed my xen configuration file, add a 'phys:hda2,hda2,w' in my
disks configration.

then in freebsd, I newfs /dev/xbd1, mount it, and use

tar -cvpf- /|(cd /mnt;tar -xf-) to move files from loop device to
physical device.

I found the tar process will block (use ps, I will see it is in 'D'
status) after some work.

I have tried async mount and softupdate, the result is same.
I tried dump and restore too, the result is same.

And the system whil not response to remote ssh login when tar block.
But it will reply to ping.

Is this a known problem to freebsd on xen?

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