Hi all, I''ve performed a benchmark on my server to compare performance with and without Xen, and with and without domUs active. I used lmbench to measure basic hardware operations on math and memory, and system calls like mmap(), fork(), exec(). The results are at http://drainbamage.nl/2009/04/05/xen-benchmark/ . It seems that Xen adds significant overhead to process creation routines (fork, exec) and mmap and page faults. However, I''m no OS expert, and I''d like your guys'' feedback on the numbers and my interpretations of them. Does Xen really add these latencies (or is my setup messy), and what is their impact in real life? Best regards, Christiaan Ottow _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Christiaan Ottow wrote:> However, I''m no OS expert, and I''d like your guys'' feedback on the > numbers and my interpretations of them. Does Xen really add these > latencies (or is my setup messy), and what is their impact in real life?Where are your CFLAGS? I am expecting you missed some thing SIGNIFICANTLY -mno-tls-direct-seg-refs. Stefan _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
I didn''t compile lmbench myself, installed it from the Ubuntu package repository What would you expect with -mno-tls-direct-seg-refs? Best regards, Christiaan Ottow On Apr 6, 2009, at 12:19 AM, Stefan de Konink wrote:> Christiaan Ottow wrote: >> However, I''m no OS expert, and I''d like your guys'' feedback on the >> numbers and my interpretations of them. Does Xen really add these >> latencies (or is my setup messy), and what is their impact in real >> life? > > Where are your CFLAGS? > > > I am expecting you missed some thing SIGNIFICANTLY -mno-tls-direct- > seg-refs. > > > Stefan > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users