[Xen-devel] Performance on QEMU IDE disks

["P M, Priya (STSD)" <pm.priya@xxxxxx>]

Hi,

 

We have Intel VT enabled system loaded with Xen 3.0.2 and qemu based FC5+linux 2.6.16 as a guest operating system.

We did some performance tests on this guest OS and the results are

                                                                                    Sequential Write - IOPs

IO size

512B

4K

16K

32K

FC5 Native

162

163

156

147

FC5_DOM1(Linux 2.6.16 - Full Virtualization) - qemu based

1305

742

285

155

 

We have disabled the Write Cache using sdparm and hdparm utilities. But if you see the results in Linux Full Virtualization, the Sequential Write IOPs are better than Native performance. I am wondering how is this possible? Is there anywhere the caching is happening in the full virtualization case? If you have an idea about this behavior, please let me know.

 

Thanks

Priya

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