Quoting r. Michael S. Tsirkin <[EMAIL PROTECTED]>: > Subject: Re: [PATCH] 2/2 : ip over ib tx/rx split > > > Quoting r. Roland Dreier <[EMAIL PROTECTED]>: > > Subject: Re: [openib-general] [PATCH] 2/2 : ip over ib tx/rx split > > > > Roland> The only difference is that we unlock the receive CQ and > > Roland> lock the send CQ in the middle. > > > > Michael> Are you sure? I *do* have msi-x on these machines. > > > > Of course I'm not sure, but as far as I know, with the current drivers > > even with MSI-X there's still only one completion interrupt handler, > > which can only run on one CPU at a time. > > > > Sounds convincing. So the improvement is probably due to > better send/receive parallelism we are getting in mthca.
Roland, I just made some measurements. With the split lock in mthca, but a shared cq in ip over ib, bandwidth goes up from around 300 to around 313 Mb/sec. So for the mthca patch, I see almost 4% improvement - seems like a good thing, so please consider applying it. My ip over ib patch seems to need a bit more work before its actually useful. -- MST - Michael S. Tsirkin _______________________________________________ openib-general mailing list [email protected] http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
