Date: Fri, 1 Oct 2004 18:56:53 -0700 (PDT) From: Doug Ambrisko <ambrisko@ambrisko.com> To: Jim Durham <durham@jcdurham.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Sudden Reboots Message-ID: <200410020156.i921ur8k022466@ambrisko.com> In-Reply-To: <200410012016.51415.durham@jcdurham.com>
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Jim Durham writes: [ Charset ISO-8859-1 unsupported, converting... ] | On Friday 01 October 2004 12:36 pm, Doug Ambrisko wrote: | > Jim Durham writes: | > | I have had this problem now with at least 3 FreeBSD servers over a period | > | of about 2 years. I had put it down to some hardware problem but it seems | > | to be too much of a coincidence with 3 different machines doing the same | > | thing. | | > How much memory are in these system?. | The Dell is a Dual Xeon 2650 with 2gb or Ram. The ISP's box has only 256 megs | or ram and the business customer's box has 512. That shouldn't be much of an issue then | > If you have 3G or more you end | > up with very little left for the kernel in the 2G space | | Can you elaborate on why this is? I did somewhat here: | > If you only have a few meg. left it doesn't take many processes to | > fork etc. then you machine blows up. The bge driver for example takes | > 4M each for the jumbo packet handling. You can recover some of this | > memory via loader.conf tunables or bump KVA_PAGES in your kernel | > config file. Still once this memory is put into the zone allocator | > (vmstat -z) in -stable it is gone from the system even if that bucket | > isn't fully used or needed :-( Most of these zones scale based on total memory which. | What would you expect to see in the logs on such a scenario? I'm surprised to | see nothing. Unless you have kernel dumps and savecore settup you will miss the panic. When a system panics it can't right our to /var/log/* | > Ironically the more memory you put in a system the less you can do with | > the system! | > | > A lot of people are starting to run into this problem since large memory | > machines are cheap. | | Well, I don't think 2gb is large by your standards? No it isn't. 3-4G machines start to hit this. Also if you bump up things like mbufs and cluster you start to hit this limit. Doug A.
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