Date: Wed, 09 Sep 1998 14:56:17 +0300 From: Yoav Cohen-Sivan <ycs@netvision.net.il> To: freebsd-hackers@FreeBSD.ORG Subject: sio FIFO overflow? Message-ID: <35F66CE1.347AAE45@netvision.net.il>
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I think I am seeig FIFO overflows during 115200 bps transfers on a
serial port. Especially with heavy disk activity. Is there a way to flag
FIFO overflows, and is there a way to check interrupt latency?
I've been seeing randomly-timed link lockups during almost every PPP
session I
initiate (both kernel and user). The lockups clear after hanging up and
redialling.
I finally lowered my bps from 115200 to 57600, and voila! lockups have
disappeared. I've spent the better part of the past 3 days banging on
the link (and my phone bill) like there's no tomorrow.
The lockups were usually during heavy link and system use, and I'm
thinking
the serial FIFO was overflowing, but the sio driver latency was too
great to respond in time.
Could this have caused some corrupted packets to be sent to my ISP
(using Cisco 5200 equipment), causing it to ignore me for the duration
of the session?
Yoav
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