[Beowulf] Re: new release of GAMMA and MPI/GAMMA

Giuseppe Ciaccio ciaccio at disi.unige.it
Tue Aug 8 12:29:32 EDT 2006


On Thu, 3 Aug 2006, Giuseppe Ciaccio wrote:

> Hello,
>
> this is to inform you that a new release of the Genoa Active Message
> MAchine (GAMMA) is available for download at the site
> 	www.disi.unige.it/project/gamma/
> Compared to the Intel PRO/1000, the back-to-back
> latency of ``Tigon 3'' seems quite disappointingly high (~21 usec, to
> be compared with the 6 usec achieved by the Intel PRO/1000).

Update.  At least part of the relatively high latency was due to Rx
coalescing/mitigation being active.  After disabling this, the latency
dropped to 14.6 usec back-to-back at user level.

giuseppe
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