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Date: Thu, 14 Jun 2007 17:08:29 -0500 From: linas@...tin.ibm.com (Linas Vepstas) To: Arnd Bergmann <arnd@...db.de> Cc: cbe-oss-dev@...abs.org, netdev@...r.kernel.org, Jeff Garzik <jeff@...zik.org> Subject: Re: [Cbe-oss-dev] [PATCH 12/15] spidernet: increase the NAPI weight On Wed, Jun 13, 2007 at 10:49:51PM +0200, Arnd Bergmann wrote: > On Wednesday 13 June 2007, Jeff Garzik wrote: > > > +/* We really really want to empty the ring buffer every time, > > > + * so as to avoid the RX ram full bug. So set te napi wieght > > > + * to the ring size. > > > + */ > > > +#define SPIDER_NET_NAPI_WEIGHT SPIDER_NET_RX_DESCRIPTORS_DEFAULT > > > > I don't see why spider_net should have a different NAPI weight from > > other drivers It was a lame attempt to try to trick napi into draining the entire RX queue in one go, with the goal of avoiding the dreaded rx ram full. I'm not sure it made much of a difference, so we can let this slide. > Would it help to do it the other way round, as in No, that would shorten the RX queue, thus making it more likely to overflow. At gigabit speeds, its petty easy to fill this thing up multiple times per jiffy. The driver should continue to operate either way, but the larger queue should keep it from being a busy beaver. --linas - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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