There are RDMA ISCSI drivers about, if your network card supports this
then using RDMA could yield a pretty big performance increase for this
sort of thing (It skips large chunks for the networking stack).
-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Artur
Linhart - Linux communication
Sent: 28 August 2008 09:03
To: 'Javier Guerra'
Cc: 'Gertjan Oude Lohuis'; xen-users@xxxxxxxxxxxxxxxxxxx; 'Tammo
Schuelke'
Subject: RE: [Xen-users] problem with extra storage via iscsi
Hello,
 As far as I know there is the limit 100Mbit at least for the hvm
guests... OK, now we have been spoken about the PV guests, it is true
:-)
 Cheers, Artur
-----Original Message-----
From: Javier Guerra [mailto:javier@xxxxxxxxxxx] 
Sent: Wednesday, August 27, 2008 7:46 PM
To: Artur Linhart - Linux communication
Cc: Gertjan Oude Lohuis; Tammo Schuelke; xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] problem with extra storage via iscsi
On Wed, Aug 27, 2008 at 12:42 PM, Artur Linhart - Linux communication
<AL.LINUX@xxxxxxxxxxx> wrote:
> Hello,
>
> From my point of view, Tammo is right...
>
> You write:
> Why would performance be better with an extra layer (dom0)?
>
> - because in DomU You can have as far as I know in maximum 100MBit
network
> device, in Dom0 You can use the gigabit (or possible 10Gbit - I did
not
> tried it) connection without problems, so any network device should
have
> then much more better performance if mapped as block device through
Dom0...
there's no 'hard' limit of DomU network performance. but it's usually
much lower than block device performance.
-- 
Javier
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