From owner-freebsd-current@FreeBSD.ORG Sat Dec 15 18:05:37 2012 Return-Path: <owner-freebsd-current@FreeBSD.ORG> Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id E2C21256; Sat, 15 Dec 2012 18:05:37 +0000 (UTC) (envelope-from adrian.chadd@gmail.com) Received: from mail-wi0-f180.google.com (mail-wi0-f180.google.com [209.85.212.180]) by mx1.freebsd.org (Postfix) with ESMTP id E3A8F8FC12; Sat, 15 Dec 2012 18:05:36 +0000 (UTC) Received: by mail-wi0-f180.google.com with SMTP id hj13so1151423wib.13 for <multiple recipients>; Sat, 15 Dec 2012 10:05:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; bh=yI89ZhXmodb2CDrycrx11CGIJo58aoQ0396euQN7jd4=; b=Zrrej/HM2rPuyEwwvqhf1igRhK60nQSuJ/DPvErHN8krQkaDUiA0cznkFYtdGrx9t6 C1Mm3mx66Rz4otinllUioCLAWN5hwrmnonFpn0J6JeS2p+ZwSvJRGFYAxyIhMY6saPPQ lA8KzTJlA76WJ91YFJYKI1ptnIB7RpaBPsqErq4lfZX43b98yOUj/LvgoTtPrjHxyWLN XvJtoiqpx79hgFO4C21wbPjvyzA4K5Yqo1hryCxw8ddGQiOwjc9EGombsjqKqzEODqMe v9J3zIC/Q1NMHhPeVYh6bRA+6BBaJRp4M/5CN9jv2KqgoG/tzs7kjXzxXRdyRCoIrcd7 PIJg== MIME-Version: 1.0 Received: by 10.180.24.4 with SMTP id q4mr8289579wif.19.1355594735846; Sat, 15 Dec 2012 10:05:35 -0800 (PST) Sender: adrian.chadd@gmail.com Received: by 10.217.57.9 with HTTP; Sat, 15 Dec 2012 10:05:35 -0800 (PST) In-Reply-To: <50CCAB99.4040308@FreeBSD.org> References: <50CCAB99.4040308@FreeBSD.org> Date: Sat, 15 Dec 2012 10:05:35 -0800 X-Google-Sender-Auth: cbYU2j5_y0TgoBYMR87_RQx4cRI Message-ID: <CAJ-VmonPu_9Psaha5aWXcukmjrr8yyU-PgY85Cnurzg-6JH3QQ@mail.gmail.com> Subject: Re: [RFC/RFT] calloutng From: Adrian Chadd <adrian@freebsd.org> To: Alexander Motin <mav@freebsd.org> Content-Type: text/plain; charset=ISO-8859-1 Cc: Davide Italiano <davide@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org>, freebsd-arch@freebsd.org X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Discussions about the use of FreeBSD-current <freebsd-current.freebsd.org> List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-current>, <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current> List-Post: <mailto:freebsd-current@freebsd.org> List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help> List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, <mailto:freebsd-current-request@freebsd.org?subject=subscribe> X-List-Received-Date: Sat, 15 Dec 2012 18:05:38 -0000 Hi, Can you please test with MIPS? David has a MIPS board now. Can you also test that various performance tests haven't been affected? Eg, do iperf tests through that MIPS board, configured up as an AP. Please test with a bunch of disk IO activity too. I know this is a lot to ask for, but I'd hate to see some driver / subsystem behaviour change because you didn't quite see the evil way the callout mechanism is used, or how the timer stuff is affecting driver pre-emption. Thanks, Adrian On 15 December 2012 08:55, Alexander Motin <mav@freebsd.org> wrote: > Hi. > > I'm sorry to interrupt review, but as usual good ideas came during the final > testing, causing another round. :) Here is updated patch for HEAD, that > includes several new changes: > http://people.freebsd.org/~mav/calloutng_12_15.patch > > The new changes are: > -- Precision and event aggregation code was reworked. Instead of previous > -prec/+prec representation, precision is now single-sided -- -0/+prec. It > allowed to significantly improve precision on long time intervals for APIs > which imply that event should not happen before the specified time. > Depending on CPU activity, mistake for long time intervals now will never be > more then 1-500ms, even if specified precision allows more. > -- Some minor optimizations were made to reduce callout overhead and > latency by 1.5-2us. Now on Core2Duo amd64 system with LAPIC eventtimer and > TSC timecounter usleep(1) call from user-level executes in just 5-6us, > instead of 7-8us before. Now it can do 180K cycles per second on single CPU > with only partial CPU load. > -- Number of kernel subsystems (dcons, syscons, yarrow, led, atkbd, > setrlimit) were modified to reduce number of interrupts, also with event > aggregation by explicit specification of the acceptable events precision. > Now my Core2Duo test system has only 30 interrupts per second in idle. If > not remaining syscons events, it could easily be 15. My IvyBridge ultrabook > first time in its history shown 5.5 hours of battery time with full screen > brightness and 10 hours with lid closed. > -- Some kernel functions were added to make KPIs more complete. > > I've successfully tested this patch on amd64 and arm. > > -- > Alexander Motin > > _______________________________________________ > freebsd-arch@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-arch > To unsubscribe, send any mail to "freebsd-arch-unsubscribe@freebsd.org"