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Re: [Xen-devel] open/stat64 syscalls run faster on Xen VM than standard Linux
Petersson, Mats wrote:
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
Sent: 28 November 2005 08:21
To: Xen Mailing List
Subject: [Xen-devel] open/stat64 syscalls run faster on Xen
VM than standard Linux
When I debugged the execution performance of an application
using strace, I found there are some system calls like open
and stat64 which run faster on XenLinux than the standard
Linux. The following is the output of running "strace -c
/bin/sh -c /bin/echo foo" on both systems. An open call runs
averagely 109 usec on standard Linux but only 41 usecs on
XenLinux. An stat64 call runs
75 usecs on standard Linux but only 19 usecs on XenLinux.
The Xen VM runs on the same physical machine as the standard
Linux. It uses loopback files in dom0 as the backends of VBDs.
Any insight is highly appreciated.
And are you using the same Loopback file-system when running native
Linux? If not, it's probably the main cause of the difference.
No, the native Linux runs on a regular linux machine and use the raw hard disk
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