lepton
2005-Aug-06 04:24 UTC
[Xen-devel] Poor write performance with physical disk on DomainU freebsd
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? _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Kip Macy
2005-Aug-06 18:45 UTC
Re: [Xen-devel] Poor write performance with physical disk on DomainU freebsd
There are some fixes to the block driver that may not be in that build.
I won''t get a chance to look into it until next week.
-Kip
On 8/5/05, lepton <ytht.net@gmail.com> wrote:> 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?
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>
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