On Wed, 30 Jun 1999, Dennis wrote:
>
> I have a customer who has been experiencing "slow downs" with a freebsd
> router....they have substantially increased performance by reducing
> MINCLSIZE. I havent tracked the source, but im trying to hypothesize what
> it might be. On the surface I cant see any relationship since very few
> routines seem dependent on that value (m_devget() in particular, but I dont
> believe they are using any driver that use it). Is it possible that they
> are running out of small mbufs (they have NMBCLUSTERS set to a very high
> value)?
>
> Any ideas would be helpful.
I have not noticed answers so far, so maybe their drivers copy mbufs very
often. AFAIK, "small" mbufs are indeed copied but "cluster" ones are not, so
when they forced the system to use more "cluster" mbufs, they got
substantial savings on copy operations.
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