Re: cvs commit: src/sys/dev/em if_em.c if_em.h

From: John Baldwin <jhb_at_freebsd.org>
Date: Mon, 14 Aug 2006 16:47:24 -0400
On Monday 14 August 2006 16:30, Matt Reimer wrote:
> On 8/13/06, Pyun YongHyeon <yongari_at_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?

It doesn't use bus_dma.

-- 
John Baldwin
Received on Mon Aug 14 2006 - 20:56:14 UTC