Date: Tue, 21 May 1996 10:16:18 +0900 (JST) From: Michael Hancock <michaelh@cet.co.jp> To: Terry Lambert <terry@lambert.org> Cc: bsdi-users@bsdi.com, freebsd-hackers@freebsd.com Subject: Re: ISDN Compression Load on CPU Message-ID: <Pine.SV4.3.93.960521101333.4739B-100000@parkplace.cet.co.jp> In-Reply-To: <199605202119.OAA28500@phaeton.artisoft.com>
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On Mon, 20 May 1996, Terry Lambert wrote: > > SDLComm has a new PCI card called the RISCom/Pri. Primary rate has 23 > > 64Kbps B-Channels. I wonder how many cards can be put into a P90 box > > running BSD Unix before the compression overloads the CPU? > > The RISC CPU you mean.. dunno. Probably what I should've meant. I'm not sure how the processing would be divided between the card and the host CPU. > > How heavy is the computational load of something like STAC compression? > > As a percentage of CPU: depends on your CPU. > > As a percentage of file I/O overhead: ~17%, assuming average cache > locality, degrading to ~36% for cache-busting (like IOZone). This > was on a 486 DX/2-66, so your mileage may vary. > -mh
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