[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [Xen-devel] open/stat64 syscalls run faster on Xen VM than standard Linux
> -----Original Message----- > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx > [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of > xuehai zhang > Sent: 28 November 2005 08:21 > To: Xen Mailing List > Subject: [Xen-devel] open/stat64 syscalls run faster on Xen > VM than standard Linux > > Dear all, > 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. -- Mats > Thanks. > Xuehai > [snip of tables] _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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