[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-users] Shared Storage

On 04/26/2011 04:31 PM, Javier Guerra Giraldez wrote:
On Tue, Apr 26, 2011 at 3:21 PM, Jonathan Tripathy<jonnyt@xxxxxxxxxxx>  wrote:
On 26/04/2011 18:53, Javier Guerra Giraldez wrote:
more like .96gbit storage and .04gbit protocol.... or .993/.007 on jumbo

Are you using TCP and/or iSCSI offload in your NIC? Those seem like pretty
good numbers.

that's the protocol overhead; what John guessed would be .8/.2   He's
right in that no amount of offloading or CPU power would improve on
that, but his numbers are way off.

Some good summary numbers are near the bottom here (PDF):


With a MTU of 1500, they're claiming 94.93% payload. On GbE, I don't believe I've seen more than ~100MB/s on any protocol, hence my estimate of 20% overhead.


John Madden
Sr UNIX Systems Engineer / Office of Technology
Ivy Tech Community College of Indiana

Xen-users mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.