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RE: [Xen-users] disk backend performance

To: "'James Harper'" <james.harper@xxxxxxxxxxxxxxxx>, "'Thomas Halinka'" <lists@xxxxxxxxx>, "'Stefan de Konink'" <stefan@xxxxxxxxx>

From: "Venefax" <venefax@xxxxxxxxx>

Date: Fri, 28 Nov 2008 22:00:41 -0500

Cc: 'Xen Users' <xen-users@xxxxxxxxxxxxxxxxxxx>, 'Guillaume' <guillaume.chardin@xxxxxxxxx>

Delivery-date: Fri, 28 Nov 2008 19:01:29 -0800

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So: over a dedicated cable with jumbo frames it is actually smarter to use ISCSI than AOE? Is that your conclusion? -----Original Message----- From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of James Harper Sent: Friday, November 28, 2008 9:56 PM To: Thomas Halinka; Stefan de Konink Cc: Xen Users; Guillaume Subject: RE: [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 _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users

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