Date: Tue, 5 Apr 2011 06:46:07 +0000 (UTC) From: Adrian Chadd <adrian@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/mips/atheros if_arge.c Message-ID: <201104062118.p36LIKwr009544@repoman.freebsd.org>
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adrian 2011-04-05 06:46:07 UTC FreeBSD src repository Modified files: sys/mips/atheros if_arge.c Log: SVN rev 220357 on 2011-04-05 06:46:07Z by adrian if_arge has had a strange bug that only appears during high traffic levels. TX would hang, RX wouldn't. A bit of digging showed the interface send queue was full, but IFF_DRV_OACTIVE was clear and the hardware TX queue was empty. It turns out that there wasn't a check to drain the interface send queue once hardware TX had completed, so if the interface send queue had filled up in the meantime, subsequent packets would be dropped by the higher layers and if_start (and thus arge_start()) would never be called. The fix is simple - call arge_start_locked() in the software interrupt handler after the hardware TX queue has been handled or a TX underrun occured. This way the interface send queue gets drained. Revision Changes Path 1.17 +21 -0 src/sys/mips/atheros/if_arge.c
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