From owner-freebsd-hackers Thu Jul 2 06:33:31 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id GAA21378 for freebsd-hackers-outgoing; Thu, 2 Jul 1998 06:33:31 -0700 (PDT) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from att.com (kcgw1.att.com [192.128.133.151]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id GAA21372 for ; Thu, 2 Jul 1998 06:33:27 -0700 (PDT) (envelope-from sbabkin@dcn.att.com) From: sbabkin@dcn.att.com Received: by kcgw1.att.com; Thu Jul 2 08:33 CDT 1998 Received: from dcn71.dcn.att.com ([135.44.192.112]) by kcig1.att.att.com (AT&T/GW-1.0) with ESMTP id IAA08550 for ; Thu, 2 Jul 1998 08:33:21 -0500 (CDT) Received: by dcn71.dcn.att.com with Internet Mail Service (5.0.1458.49) id ; Thu, 2 Jul 1998 09:33:18 -0400 Message-ID: To: rminnich@Sarnoff.COM, hackers@FreeBSD.ORG Subject: RE: timeout granularity (was: Re: Console driver...) Date: Thu, 2 Jul 1998 09:33:18 -0400 X-Priority: 3 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.0.1458.49) Content-Type: text/plain Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > -----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