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

Scott Long scottl at
Wed Aug 23 04:08:46 UTC 2006

John Polstra wrote:

> 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

Fast interrupts have been sharable as of about a year ago.


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