Date: Fri, 05 Jun 1998 16:04:50 -0400 (EDT) From: Simon Shapiro <shimon@simon-shapiro.org> To: Greg Lehey <grog@lemis.com> Cc: Mike Smith <mike@smith.net.au>, Bob Willcox <bob@luke.pmr.com>, Karl Pielorz <kpielorz@tdx.co.uk>, tcobb <tcobb@staff.circle.net>, "freebsd-current@freebsd.org" <freebsd-current@FreeBSD.ORG>, Michael Hancock <michaelh@cet.co.jp> Subject: Re: DPT driver fails and panics with Degraded Array Message-ID: <XFMail.980605160450.shimon@simon-shapiro.org> In-Reply-To: <19980605093349.K768@freebie.lemis.com>
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On 05-Jun-98 Greg Lehey wrote:
...
>> Actually, SMP interrupt service is slow enough that this probably never
>> has
>> a chance to show at all.
>
> No way. Murphy is particularly unforgiving when it comes to race
> conditions in interrupt handlers. Have 50 interrupts a second from
> two processors, and sooner or later you're going to hit it.
Then my theory as to what causes it is useless :-) Still, SMP is the least
sensitive (as in ``never seen here'') to this problem.
As an aside, I cannot, under SMP get the same number of I/Os per second as
UP. Is it a FreeBSD thing, or Simon/DPT thing?
Simon
---
Sincerely Yours,
Simon Shapiro Shimon@Simon-Shapiro.ORG
770.265.7340
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