Re: [Xen-users] Increasing throughput on xen bridges

[carlopmart <carlopmart@xxxxxxxxx>]

Mark Williamson wrote:
> >   I have a rhel 5.1 xen server with two rhel 3 ES hvm guests installed.
> > Both rhel3 guests use an internal xen bridge (xenbr1) which it isn't binded
> > to any physical interface host. On this bridge throughput it is very very
> > poor, only 2.5 Mbs. How can I increase this throughput???
> The bridge driver does add overhead but I suspect that your poor performance 
> is more likely due to the HVM emulation of the network card than the bridge 
> driver.
> If there's a Linux 2.6 kernel available for RHEL 3, you might be able to 
> compile the PV drivers from the "unmodified_drivers" directory in the Xen 
> tree.  These would improve performance.
> There were some patches posted to the list from Virtual Iron that enabled PV 
> drivers to be used under a Linux 2.4-based kernel, which would enable you to 
> compile against a 2.4 kernel in your HVM machine.
> The above suggestions would mean that you keep using a RHEL3 kernel in the HVM 
> virtual machine but just add PV drivers.
> Finally, http://xen.org/download/dl_304guest_rhel3.html contains a download 
> link for a Xen-patched 2.4.21 kernel for RHEL 3.8.  This is not an official 
> RedHat supported kernel, since it's been patched by XenSource.  Therefore it 
> could perhaps impact your support agreement...  But if you converted to a PV 
> domain using it you might improve performance, particularly for network.
> This suggestion differs in that you would actually be converting from using an 
> HVM domain to using a PV domain with an entirely different kernel.
> Cheers.
> Mark
Thanks Mark, but i can't find Virtual Iron's patches that you say ... Where they 
are??
--
CL Martinez
carlopmart {at} gmail {d0t} com

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