> Quoting Pradeep Satyanarayana <[EMAIL PROTECTED]>: > Subject: Re: [ofa-general] [PATCH] ipoib/cm: use common CQ for all TX QPs > > Michael S. Tsirkin wrote: > > Use common CQ for all TX QPs: keep a per-device counter of outstanding TX > > WRs, > > and stop the interface when this counter reaches the send queue size, to > > avoid > > CQ overruns. This should help reduce the number of interrupts for > > bi-directional traffic (such as TCP). > > CQ overrun generates asynchronous errors. If CQ overruns are avoided, how > does that > reduce interrupts? > > On a side note, as a further extension to this idea, would it be worth > considering > sendq_size and recvq_size being device specific in the future, instead of > being > module specific?
How would you do this without resize QP support in low leve drivers? > > This helps fix "driver is hogging interrupts" errors reported for IPoIB > > send side. > > See e.g. https://bugs.openfabrics.org/show_bug.cgi?id=508 > > > In bug 508, timer ticks were lost because some device was hogging interrupts. > What is the association between dropping packets and hogging interrupts? > Can you expand on that? This patch fixes the hogging interrupts problem by polling TX completions from NAPI thread. -- MST _______________________________________________ general mailing list [email protected] http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
