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Date: Tue, 20 Feb 2007 16:44:33 -0500 From: lsorense@...lub.uwaterloo.ca (Lennart Sorensen) To: pcnet32@...izon.net Cc: netdev@...r.kernel.org Subject: Re: Re: Strange connection slowdown on pcnet32 On Mon, Feb 19, 2007 at 06:59:16PM -0500, Lennart Sorensen wrote: > I am also noticing the receive error count going up, and the source is > this code: > > if (status & 0x01) /* Only count a general error at the */ > lp->stats.rx_errors++; /* end of a packet. */ > > It appears this means I am receiving a frame marked with "End Of Packet" > but without "Start of Packet". I have no idea how that happens, but it > shouldn't be able to make the driver and MAC stop processing the receive > ring. Well the packets actually have both start and end marked, but also have overflow marked, so the cpu simply isn't keeping up it seems (It is taking about 100% of the cpu to push through 6500KB/s). Certainly the CONFIG_X86_OOSTORE makes a major difference, although I am still not sure why. Simply skipping ahead one or two receive descriptors when the current one is marked as owned by the MAC but the one a few ahead is owned by the CPU allows it to continue receiving when it happens. I really want to find out why it happens though, although I am not sure how to go about doing that. -- Len Sorensen - 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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