Date: Thu, 9 May 96 10:42 CDT From: uhclem@nemesis.lonestar.org (Frank Durda IV) To: phk@freefall.freebsd.org, freebsd-bugs@freefall.freebsd.org Subject: Re: kern/770 Message-ID: <m0uHXrP-000DGDC@nemesis.lonestar.org>
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[0]Synopsis: Floppy kernel won't boot with T485 or IDT L2 cache FDIV032 [0] [0]State-Changed-From-To: open-feedback [0]State-Changed-By: phk [0]State-Changed-When: Thu May 9 04:07:19 PDT 1996 [0]State-Changed-Why: [0]Can you update us on this ? Can we close it ? Uh, this was closed a long time ago (I have a copy of the close notice here dated 26-Oct-95) because it works under 2.1.0. Only 2.0.5 and some adjacent SNAPs broke floppy booting with this cache installed. Something to do with the way the kernel uncompressed itself worked badly on this cache system. However, I will test it under the latest SNAP and see if it is still fixed since some other people have reported problems with the boot floppy recently. I will do this in the next few days. There is related discussion on the use on this cache system coming up shortly, but I am waiting for closure from Intel on a few points. A few months ago, I reported problems with a machine that I gradually replaced every component in and finally was left with the presence of the cache module (tried several different cache modules and the crashes persisted.) With the cache module out, it ran 14 days without crashing, a record for FreeBSD 2.x (FreeBSD 1.1.5.1 on the same hardware made 127 days.) Put the cache back in, it died within six days, then in one day, then four hours, then three days. Removed the cache again, and we are now approaching 20 days of uptime. However a different system has run for over 60 days with the cache module present, so it appears that you have to tickle it wrong to get it to fail. This other system does have a different mix of peripherals. There apparently are flaws in this cache subsystem that Intel knows about but supposedly there are workarounds. Hopefully they will tell all. Frank Durda IV <uhclem@nemesis.lonestar.org>|"The Knights who say "LETNi" or uhclem%nemesis@rwsystr.nkn.net | demand... A SEGMENT REGISTER!!!" |"A what?" or ...letni!rwsys!nemesis!uhclem |"LETNi! LETNi! LETNi!" - 1983
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