Date: Thu, 10 Apr 2003 15:22:36 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Petri Helenius <pete@he.iki.fi> Cc: freebsd-performance@freebsd.org Subject: Re: tcp_output starving -- is due to mbuf get delay? Message-ID: <3E95EEAC.AE812757@mindspring.com> References: <3E94A22D.174321F0@lbl.gov> <3E94A8C4.3A196E42@lbl.gov> <05b601c2ffa2$ed87a5b0$932a40c1@PHE>
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Petri Helenius wrote: > There was a discussion on mballoc performance on freebsd-net about a month ago > but it has since died without conclusion. Actually, a researcher at UKY implemented an alternate allocator using an explicit freelist and mp_machdep.c tricks, rather than using the zone/slab/uma stuff, and obtained a significant speedup. Yes, I was involved in suggesting implementation details. The resulting code is not SMP-safe, however, unless you are willing to use a global freelist (obviously). BTW: The zone allocator *still* calcualtes some values each time it goes back to the system for more pages, that it should precalculate and cache instead. -- Terry
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