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Date: Tue, 22 Aug 2006 20:54:44 -0700 (PDT)
From: John Polstra <jdp@polstra.com>
To: Pyun YongHyeon <pyunyh@gmail.com>
Cc: src-committers@FreeBSD.org, "Patrick M. Hausen" <hausen@punkt.de>,
	cvs-src@FreeBSD.org, cvs-all@FreeBSD.org,
	Gleb Smirnoff <glebius@FreeBSD.org>, Pyun YongHyeon <yongari@FreeBSD.org>
Subject: Re: cvs commit: src/sys/dev/em if_em.c
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On 23-Aug-2006 Pyun YongHyeon wrote:
> On Tue, Aug 22, 2006 at 07:23:33PM +0400, Gleb Smirnoff wrote:
> I think that problem is different one. That problem happens when
> interrupt is shared with other devices. In these configuration
> em(4) misses lots of Tx completion interrupts and devices that
> use the shared interrupt stop working in the long run.
> It seems that debug.mpsafenet=0 mitigate the issue.
> 
>  > So I think there is a problem in FreeBSD or driver, not in chip.
>  > 
> Agreed. If my memory serve me right it introduced right after
> switching to taskqueue(9) in interrupt handling(rev, 1.98).

I was wondering about something in connection with this.  The em
interrupt handler is now a "fast" handler, but the interrupt is still
allocated with bus_alloc_resource_any(..., RF_SHAREABLE).  If I
remember correctly, fast interrupts cannot be shared.  So, isn't it
wrong to allocate the interrupt with RF_SHAREABLE?

John