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[Xen-users] Performance issue with blktap2?
| To: | xen-users@xxxxxxxxxxxxxxxxxxx |
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| Subject: | [Xen-users] Performance issue with blktap2? |
| From: | Nathan March <nathan@xxxxxxxxxxxxxxxxxxxx> |
| Date: | Fri, 23 Jul 2010 14:59:28 -0700 |
| Delivery-date: | Fri, 23 Jul 2010 15:01:00 -0700 |
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Everything I've read online indicates that I should expect equal or
greater performance from the blktap drivers instead of file access,
unfortunately this isn't the case on my test machine
- Dual Xeon L5640, dom0 pinned to 1 cpu backed by a netapp nfs mount.- Dom 0 running a recent checkout (last day or two) from xen-4.0-testing with the pvops kernel from Jeremy's testing (2.6.31.13)
- Dom U running 2.6.32.8
Times indicated are from "time bonnie++ -u 1":
file inside the dom0 (mount -o loop):
file inside a vm:
2m40.515s, 2m38.181s, 2m31.788s, 2m34.391s, 2m35.671s
tap:aio inside the dom0 (tapdisk2 -n and then mounting it):
3m23.040s, 3m19.900s, 3m15.406s, 3m15.594s, 3m14.867s
tap:aio inside a vm:
3m54.694s, 3m49.185s, 3m50.864s, 3m57.644s, 4m1.372s
Any thoughts? That's nearly a 50% performance hit..
Thanks!
- Nathan
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