Date: Thu, 2 Jul 1998 09:33:18 -0400 From: sbabkin@dcn.att.com To: rminnich@Sarnoff.COM, hackers@FreeBSD.ORG Subject: RE: timeout granularity (was: Re: Console driver...) Message-ID: <C50B6FBA632FD111AF0F0000C0AD71EEFF8B45@dcn71.dcn.att.com>
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> -----Original Message----- > From: Ron G. Minnich [SMTP:rminnich@Sarnoff.COM] > > On Thu, 2 Jul 1998, Luigi Rizzo wrote: > > polling if the test is successful. Sooner or later hopefully we > > will move to large values of HZ anyways. > > good point. I've experimented with HZ of 10,000 on a 486-25. 10K was a > > bit large for this machine, but 2500 was no problem. What's the > largest > HZ anyone out there has used? I'd expect that 10K or 20K would not be > a > real problem. Anyone know? > I did not experimented with high HZ but rather long time ago I've experimented with high-speed transfers through serial ports (the ports I had at the time were without FIFO). The measurements have shown that handling 115200 bps transfer caused 11520 interrupts per second and ate up about 20% CPU of 20 MHz 386 in the interrupt handler. The OS was SCO Unix 3.2.1. -SB To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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