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[Xen-devel] why do I get bad disk write performance in the kernel 3.1?
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx |
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| Subject: | [Xen-devel] why do I get bad disk write performance in the kernel 3.1? |
| From: | Roberto Scudeller <beto.rvs@xxxxxxxxx> |
| Date: | Wed, 9 Nov 2011 12:58:27 -0200 |
| Delivery-date: | Wed, 09 Nov 2011 07:06:17 -0800 |
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Hi all, I'm testing the new kernel 3.1 from kernel.org, and xen 4.1.2-rc1-pre. I execute a CrystalMark IO Benchmark, in windows 2003 VM with gplpv drivers, and receive an amazing result for reading, but the write numbers are very disappointing. I run the VM in local disk, and receive these numbers: Seq read: 244 MB/s 512K read: 239 MB/s 4K read: 27 MB/s 4K QD 32: 90 MB/s Seq write: 20 MB/s 512K: 20 MB/s 4K: 8 MB/s 4K QD 32: 12MB/s In older kernel, 2.6.32.x: Seq read: 189 MB/s 512K read: 169 MB/s 4K read: 11 MB/s 4K QD 32: 34 MB/s Seq write: 177 MB/s 512K: 166 MB/s 4K: 12 MB/s 4K QD 32: 36 MB/s Could anyone help me. Why is the new kernel faster in reading, but too slow writing ? -- Roberto Scudeller _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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