On Sun, Jan 23, 2005 at 12:00:17AM +0200, Michael S. Tsirkin wrote: > Quoting r. Grant Grundler <[EMAIL PROTECTED]>: > > Subject: MMIO reads for IPoIB w/MSI-X > > > > Hi all, > > In trying to understand why netperf TCP_STREAM sucks on the ia64 platform > > I'm slowly collecting more data. I didn't really have any time this > > week to poke at this issue. > > > > The follow data confirms in MSI-X mode mthca is essentially doing > > no MMIO reads. > > An additional advantage of MSI-X is that interrupts are not shared. > But how is this related to ia64?
How is _what_ related to ia64? MMIO reads hurt perf. MSI-X shouldn't need any MMIO reads and I confirmed that is fact the case as a first step to understanding why ia64-linux perf is "suboptimal". grant _______________________________________________ openib-general mailing list [email protected] http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
