Date: Tue, 5 Oct 1999 15:02:07 +0300 (EEST) From: Adrian Penisoara <ady@warpnet.ro> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: freebsd-current@FreeBSD.ORG, freebsd-stable@FreeBSD.ORG Subject: Re: [Patches avail?] Re: MMAP() in STABLE/CURRENT ... Message-ID: <Pine.BSF.4.10.9910051443270.1079-100000@ady.warpnet.ro> In-Reply-To: <199910041929.MAA68462@apollo.backplane.com>
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Hi, On Mon, 4 Oct 1999, Matthew Dillon wrote: > : Excuse my intrusion, but could you be so kind to tell me whether you had > :the time to build patches for these MMAP-related freezes ? If not could > :you recommend me some workarounds ? > : > : I have a -stable production server that keeps (solidly) blocking pretty > :often (I don't get over 3 days uptimes). If you need details just let me > :know. > : > :> -Matt > :> Matthew Dillon > :> <dillon@backplane.com> > : Thanks, > : Ady (@warpnet.ro) > > Well, your lockups may or may not be related to the remaining mmap > problems. They could be related to the swap fragmentation problems > in stable, or they could be related to something else entirely. In > order to determine the cause of your lockup problems, some additional > information is necessary. The easiest way to get the information is > to enable DDB and kernel core dumps so you can panic the machine from The problem is that the machine is completely locked, I can't get into the debugger with CTR-ALT-ESC; no panics so there are no coredumps catched. Any advise ? Could you escape in the debugger when you were hit by these bugs ? > the console and get a core. Once you have the core > 'cd /var/crash; ps -M vmcore.X -N kernel.X' (where X is the latest > dump number) can be used to determine what the processes were doing > when they locked up. > > The two most common VM-related lockups in -stable are: > > (1) swap metadata fragmentation due to paging in the face of large > running processes (system runs out of KVM), and I have: squid (20Mb), nntpcached (17Mb SIZE, 1Mb RES), apache, named, MFS, a few PPP processes and the rest of the standard menu. > > (2) write()ing the mmap'd area of one file descriptor to another. > OK, how about some workarounds, I can't wait anylonger for this to be fixed, my situation got critical. Should I downgrade to 3.1-RELEASE (that hadn't exhibit this way) or can I dare a 4.0-CURRENT (are these problems present in -current too ?) ? > -Matt > Matthew Dillon > <dillon@backplane.com> > Thanks, Ady (@warpnet.ro) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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