RE: [Xen-users] disk backend performance

To:	"Thomas Halinka" <lists@xxxxxxxxx>, "Stefan de Konink" <stefan@xxxxxxxxx>
Subject:	RE: [Xen-users] disk backend performance
From:	"James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date:	Sat, 29 Nov 2008 13:56:08 +1100
Cc:	Xen Users <xen-users@xxxxxxxxxxxxxxxxxxx>, Guillaume <guillaume.chardin@xxxxxxxxx>
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Thread-topic:	[Xen-users] disk backend performance

> >
> > iSCSI + pvSCSI seems to be optimal I guess.
> 
> iSCSI is pretty slow, because of all the tcp-ip overhead. Try AoE
since
> its Layer 2 (Ethernet)
> 

If you implement iSCSI in software then the overhead could matter. If
it's implemented in hardware though (eg an iSCSI HBA) then the
processing overhead becomes negligible. With jumbo frames, the IP+TCP
header overhead (40 bytes) is also negligible.

James

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RE: [Xen-users] disk backend performance