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[Xen-users] overhead of Xen when using iSCSI
| To: | xen-users@xxxxxxxxxxxxxxxxxxx |
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| Subject: | [Xen-users] overhead of Xen when using iSCSI |
| From: | Siim Vahtre <siim_@xxxxxxxx> |
| Date: | Sun, 3 Jun 2007 11:56:21 +0300 (EEST) |
| Delivery-date: | Sun, 03 Jun 2007 01:50:52 -0700 |
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I have setup iSCSI targets (with open-iscsi) to dom0 (Xen 3.1), which are exported to paravirtualized guests: disk = [ 'phy:/dev/iscsi/test0,hda1,w' ]Everything works fine, but there is huge overhead. If I write to iSCSI device in dom0 I get write speeds of about 29Mbytes/s, but if I write to /dev/hda1 in domU I only get about 14Mbytes/s. This kind of performance drop does not happen with regular disks or even NBD - they have some overhead but not 50% like I have with iSCSI. I have searched the list and I know that some people have successfully run setup similar to mine, so I'd like to ask if anyone could please share their experience and tell me if 50% performance drop is really normal. Thanks! _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users |
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