John-Mark Gurney wrote: > Andre Oppermann wrote this message on Fri, Sep 29, 2006 at 23:59 +0200: >> Just don't overengineer the stuff. Mbufs are only used temporarily and >> a bit theoretical waste is not much a problem (so far at least). > > Well, I beg to differ... most gige cards grab mbuf+cluster for every > single ring buffer they have.. which is usually 512... so every gige > interface for the most part consumes 1meg of memory that is not > reusable... because if we run out of mbuf+clusters to replace in the > receive ring, we will not tap into the 1meg of mbuf+clusters available > to us... so, if you have a quad gige, that's 4megs wasted, plus w/ the > fact that we could only use ~65% of that memory, that's a lot of memory > wasted... The problem is the network cards again. Only a few allow different rx rings to be used (for example bge(4)) where you can have multiple mbuf (+cluster) sizes and the card choses the smallest fit at receive time. > Yeh, everyone says you have gigs of memory, but do we really want to > be known as the wasteful OS? -- AndreReceived on Fri Sep 29 2006 - 21:30:29 UTC
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