RE: [Xen-users] xen & iSCSI

[Jeff Sturm <jeff.sturm@xxxxxxxxxx>]

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Daniel De Marco
> Sent: Thursday, September 24, 2009 2:13 PM
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] xen & iSCSI
> 
> I attach the iSCSI targets to dom0 and if I use them from dom0 I
obtain
> good performance with simple dd tests (~100MB/s both reading and
> writing).
> 
> I then use the block devices for the domU and if I repeat the same dd
test
> from within the domU the write performace is still good (~100MB/s),
but
> the read performance is cut in half (~55MB/s).

That's odd.

How many physical CPU's (cores) do you have?  How many VCPU's have you
given to dom0 and domU?

Does it make any difference if you pin the dom0 VCPU, or domU VCPU, or
both?

-Jeff



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