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Date: Mon, 14 Aug 2006 13:30:37 -0700
From: "Matt Reimer" <mattjreimer@gmail.com>
To: "Pyun YongHyeon" <yongari@freebsd.org>
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References: <200608140150.k7E1osuf005683@repoman.freebsd.org>
Cc: cvs-src@freebsd.org, src-committers@freebsd.org, cvs-all@freebsd.org
Subject: Re: cvs commit: src/sys/dev/em if_em.c if_em.h
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On 8/13/06, Pyun YongHyeon <yongari@freebsd.org> 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?

Matt