From owner-freebsd-hackers Mon Jun 23 12:00:44 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id MAA22391 for hackers-outgoing; Mon, 23 Jun 1997 12:00:44 -0700 (PDT) Received: from sendero-ppp.i-connect.net (sendero-ppp.i-Connect.Net [206.190.143.100]) by hub.freebsd.org (8.8.5/8.8.5) with SMTP id MAA22382 for ; Mon, 23 Jun 1997 12:00:39 -0700 (PDT) Received: (qmail 5955 invoked by uid 1000); 23 Jun 1997 19:00:26 -0000 Message-ID: X-Mailer: XFMail 1.2-alpha [p0] on FreeBSD Content-Type: text/plain; charset=iso-8859-8 Content-Transfer-Encoding: 8bit MIME-Version: 1.0 Date: Mon, 23 Jun 1997 12:00:26 -0700 (PDT) Organization: Atlas Telecom From: Simon Shapiro To: FreeBSd-Hackers@FreeBSD.ORG Subject: I/O Errors with PPP Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk Hi Y'all, This is a continuation of a problem we encounter when running the new DPT SCSI driver on a Pentium Pro machine. To make long stories short, here is what we did: * Setup kernel PPP session to our favorite ISP. We tried, V34, 64K ISDN and 128Kb ISDN. Same result. * Start make release, make world, or dump. Result: Either the system FREEZES solid or all access to a given disk devie blockes indefinitely. The second case seems more common. To verify, we had another scenario: * Do NOT start PPP * Start X11 (XF8633), open an xterm, login to another system and run an endless loop of ``ls -alR''. * Start a compile, dump to tape (sure crasher) or even large dump on two tape drives at the same time. Result: Perfect behavior and completion. The above are with or WITHOUT software interrupts enabled in the driver. Actually, these results are reproducable wit hthe software interrupts #ifdef`ed out of the driver. Load does not seem to matter, as long as there is some. We managed to get crashes overnight when cvsup was running from a cron entry, or receiving email. Any suggestions will be appreciated. Simon P.S. We do see an occsional sio buffer overflow when running ISDN.