Date: Fri, 26 Dec 2003 16:44:07 +0100 (CET) From: Sten <sten@blinkenlights.nl> To: Dmitry Pryanishnikov <dmitry@atlantis.dp.ua> Cc: current@freebsd.org Subject: Re: [SOLVED] RE: [Backtrace] 4.9 and 5.1-RELEASE occasionly panic Message-ID: <Pine.SOL.4.58-Blink.0312261634180.12188@tea.blinkenlights.nl> In-Reply-To: <20031225214950.M86827@atlantis.atlantis.dp.ua> References: <20031225214950.M86827@atlantis.atlantis.dp.ua>
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On Thu, 25 Dec 2003, Dmitry Pryanishnikov wrote: > > Hello! > > > From: Sten <sten@blinkenlights.nl> > > > > I'd really love getting rid of most hardcoded memory allocations > > in the fbsd kernel, with the main bugger being NMBCLUSTERS, > > which one always forgets about untill it's too late :(. > > In solaris auto-tuning has been a top priority for a long while, > > and propper dynamic tuning should get it right ( or even better ) > > in 99% of the cases. People with other needs should be able > > to build a custom kernel. > > You need _not_ to build custom FreeBSD kernel in order to increase > NMBCLUSTERS. Both CURRENT and STABLE allows setting it from loader.conf: > > kern.ipc.nmbufs="32768" # Number of mbufs > kern.ipc.nmbclusters="16384" # Number of mbuf clusters > > But yes, you have to reboot your system if you want to raise them. true, but my point is that these kind of static limits are kind of silly. I have a machine with plenty of memory, when I start doing serious network traffic it dies, ecause freebsd doesn't use available memory. Static allocations are suboptimal and in corner cases they lead to loss of network connectivity or crashes. I do know that fixing these problems is a lot of work, which is why I suggested it as a goal for 6.0. to throw in a fully innapropriate quote : <Linus> In other words, it's ok for a developer to say: "Ok, what happens if you do the above echo?" to figure out whether maybe the problem is due to excessive spurgel-production in the VM frobnicator, but it is NOT OK to say "you can tweak it for your use, so don't complain about the bad behaviour" -- Sten Spans "There is a crack in everything, that's how the light gets in." Leonard Cohen - Anthem
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