Re: [SOLVED] RE: [Backtrace] 4.9 and 5.1-RELEASE occasionly panic

From: Sten (sten_at_blinkenlights.nl)
Date: 12/26/03

  • Next message: jaime_at_snowmoon.com: "uname weirdness after kernel/OS update" 
    Date: Fri, 26 Dec 2003 16:44:07 +0100 (CET)
To: Dmitry Pryanishnikov <dmitry@atlantis.dp.ua>

    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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