On Mon, Aug 14, 2006 at 01:30:37PM -0700, Matt Reimer wrote: > On 8/13/06, Pyun YongHyeon <[EMAIL PROTECTED]> wrote: > >yongari 2006-08-14 01:50:54 UTC > > > > FreeBSD src repository > > > > Modified files: > > sys/dev/em if_em.c if_em.h > > Log: > > Overhaul Rx path to recover from mbuf cluster allocation failure. > > o Create one more spare DMA map for Rx handler to recover from > > bus_dmamap_load_mbuf_sg(9) failure. > > o Make sure to update status bit in Rx descriptors even if we failed > > to allocate a new buffer. Previously it resulted in stuck condition > > and em_handle_rxtx task took up all available CPU cycles. > [snip] > > Is it possible that the RELENG_4 if_em driver would suffer from the > same problems, particularly the stuck/CPU-chewing problem? >
I think the problem exist in RELENG_4 too. If em_get_buf() fails em(4) exits main Rx loop but still does not update status bits in the Rx descriptor. I think you can easily experiment the problem with "kern.ipc.nmbclusters". > Matt -- Regards, Pyun YongHyeon _______________________________________________ cvs-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/cvs-all To unsubscribe, send any mail to "[EMAIL PROTECTED]"
