Date: Mon, 8 Jul 1996 23:19:34 -0700 From: Andrew McRae <amcrae@cisco.com> To: bde@zeta.org.au Cc: hackers@freebsd.org Subject: Re: Some interesting papers on BSD ... Message-ID: <199607090619.XAA06381@doberman.cisco.com>
next in thread | raw e-mail | index | archive | help
bde@zeta.org.au (Bruce Evans): > The effect of fixing the spl's was very large even on unloaded systems. > TCP to localhost speeded up by 25% or so on a 486/33, because it > involves a surprisingly large number of spl's (40000/MB IIRC, but this > seems too surprisingly large) and each spl pair used 26 PIC i/o > instructions under 386BSD-0.0. The speedup would be a factor of about > 10-20 on a fast Pentium (from 1 or 2 MB/s to about 20MB/s). Of course, > a better implementation using the PIC would only involve 2 or 4 i/o > instructions per spl pair. For some quantitative measurements of the effect of spl* on networking and friends, see ftp://ftp.cisco.com/amcrae/hardprof.PS (Usenix 93 paper on hardware profiling of 386BSD). The numbers are instructive, but outdated now. Perhaps I will get around to profiling the current kernel someday. Also, ftp://ftp.cisco.com/amcrae/plug_n_play.PS is the AUUG paper on integrating PC-Card into FreeBSD. Perhaps these papers could be referenced from the web page somewhere. Cheers, Andrew McRae
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199607090619.XAA06381>