From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-x242.google.com (mail-oi0-x242.google.com [IPv6:2607:f8b0:4003:c06::242]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 1A4F33B29E for ; Wed, 25 Jan 2017 16:29:42 -0500 (EST) Received: by mail-oi0-x242.google.com with SMTP id j15so16654108oih.0 for ; Wed, 25 Jan 2017 13:29:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=sc9dlRrAHVKTGsrSfunSnH8dYL0Rz2z8ZDzhuMdScMg=; b=a6G+Bj8paxsdRFM79SA/D2Ymtm08VvGb/ebjzV73NkG1oq4GfD9B1aosoig2pwhfVs ZsdbKzcgMu+tURux4/yGW8j96iAw6tDVv5Qv2K7so4CrvudhQv7aegHWade0sQsXjnJW xrjIeyscolYojXjsY7QmU0akM4L5Ye78VxEhjSYujro1obd2S4VY6yH6fRLQ9LTkIaPR xuxa+O/aP0NQG92j1LMGB7E6qdDd4/7SL+Z1sANOiiw5UpWmuj5wtGBAnE823gPGKaM1 IMd67c72YSpcs7dngWH2B1mBoT37jUfqjRxjIlJs7cFai6cTWboiZZ2UQfFS0OevLARa zVrQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=sc9dlRrAHVKTGsrSfunSnH8dYL0Rz2z8ZDzhuMdScMg=; b=SQu6YJ43z+XjNBTkqAdjhbJGzznc7NjzBbxJgoaZ0quuNGzK/cYyWlEiCFxHcOUFED lXse8LkB74gyQc3GM1Tja3AYBoWxjsrhKZzEy/16LgYwwdjC9pdyh6AkHgj+JeEG8zxi mE4CQ0Wwao0JHe8tWCjVVKY4OLzEalDWo3j0rhaiOZsq8HpmFFmC73BhMxAUSH/z7Wgc rBd14erWvCW1tLX3Gq/qh96Eq/CkyxmFHOr5RHZDJQQ+CiApqhGu05OR/rxOC0zqXKhe muM+iuu/8AlqovYhNejGEH8vS0+x9brvXzAbT5EP6bIgj9gQ+w7Vc7eqIevQDdkR+kxb TMeg== X-Gm-Message-State: AIkVDXIjb6f/OISyozAmqvid+rO89Q3B6B/i35BltoGl+aD6CY/NFyBrwwpFIGjIDYq7m3Lx4GFbMVm58o9glg== X-Received: by 10.202.207.211 with SMTP id f202mr21543107oig.162.1485379781514; Wed, 25 Jan 2017 13:29:41 -0800 (PST) MIME-Version: 1.0 Received: by 10.157.1.21 with HTTP; Wed, 25 Jan 2017 13:29:41 -0800 (PST) In-Reply-To: References: <58D7E8D3-5661-4126-80D9-2F2D4E478B10@gmail.com> <908CA0EF-3D84-4EB4-ABD8-3042668E842E@gmail.com> <8B89C257-99D4-4A9A-96ED-A103A2089A46@gmail.com> From: Hans-Kristian Bakke Date: Wed, 25 Jan 2017 22:29:41 +0100 Message-ID: To: Jonathan Morton Cc: bloat@lists.bufferbloat.net Content-Type: multipart/alternative; boundary=001a113dea423bdbbb0546f1ee6a Subject: Re: [Bloat] Initial tests with BBR in kernel 4.9 X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Jan 2017 21:29:42 -0000 --001a113dea423bdbbb0546f1ee6a Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Actually I think that is because it may be using the newer TSC: dmesg | grep clocksource [ 0.000000] clocksource: kvm-clock: mask: 0xffffffffffffffff max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns [ 0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645519600211568 ns [ 0.000000] clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604467 ns [ 0.092665] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns [ 0.366429] clocksource: Switched to clocksource kvm-clock [ 0.378974] clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 2085701024 ns [ 1.666474] tsc: Refined TSC clocksource calibration: 3200.013 MHz [ 1.666479] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x2e20562a1bb, max_idle_ns: 440795285529 ns On 25 January 2017 at 22:26, Jonathan Morton wrote: > > > On 25 Jan, 2017, at 23:20, Hans-Kristian Bakke > wrote: > > > > =E2=80=8B[ 0.000000] ACPI: HPET 0x00000000BFFE274F 000038 (v01 BOCHS > BXPCHPET 00000001 BXPC 00000001) > > [ 0.000000] ACPI: HPET id: 0x8086a201 base: 0xfed00000 > > [ 0.000000] clocksource: hpet: mask: 0xffffffff max_cycles: > 0xffffffff, max_idle_ns: 19112604467 ns > > [ 0.000000] hpet clockevent registered > > [ 0.362335] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0 > > [ 0.362339] hpet0: 3 comparators, 64-bit 100.000000 MHz counter > > [ 0.661731] rtc_cmos 00:00: alarms up to one day, y3k, 114 bytes > nvram, hpet irqs > > Conspicuously absent here is a line saying =E2=80=9Cclocksource: Switched= to > clocksource hpet=E2=80=9D. That may be worth examining in more detail. > > - Jonathan Morton > > --001a113dea423bdbbb0546f1ee6a Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Actually I think that is because it may be using the newer TSC:=
=C2=A0dmesg | grep clocksource
[ =C2=A0 =C2=A00.000000] clocksource: kvm-clock: mask: = 0xffffffffffffffff max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns<= /div>
[ =C2=A0 =C2=A00.000000] clocksource: ref= ined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645519= 600211568 ns
[ =C2=A0 =C2=A00.000000] clo= cksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112= 604467 ns
[ =C2=A0 =C2=A00.092665] clocks= ource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 76450= 41785100000 ns
[ =C2=A0 =C2=A00.366429] c= locksource: Switched to clocksource kvm-clock
[ =C2=A0 =C2=A00.378974] clocksource: acpi_pm: mask: 0xffffff max_cycl= es: 0xffffff, max_idle_ns: 2085701024 ns
= [ =C2=A0 =C2=A01.666474] tsc: Refined TSC clocksource calibration: 3200.013= MHz
[ =C2=A0 =C2=A01.666479] clocksource= : tsc: mask: 0xffffffffffffffff max_cycles: 0x2e20562a1bb, max_idle_ns: 440= 795285529 ns

On 25 January 2017 at 22:26, Jonathan Morton <chromatix99@gmail.com> wrote:

> On 25 Jan, 2017, at 23:20, Hans-Kristian Bakke <hkbakke@gmail.com> wrote:
>
> =E2=80=8B[=C2=A0 =C2=A0 0.000000] ACPI: HPET 0x00000000BFFE274F 000038= (v01 BOCHS=C2=A0 BXPCHPET 00000001 BXPC 00000001)
> [=C2=A0 =C2=A0 0.000000] ACPI: HPET id: 0x8086a201 base: 0xfed00000 > [=C2=A0 =C2=A0 0.000000] clocksource: hpet: mask: 0xffffffff max_cycle= s: 0xffffffff, max_idle_ns: 19112604467 ns
> [=C2=A0 =C2=A0 0.000000] hpet clockevent registered
> [=C2=A0 =C2=A0 0.362335] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0
> [=C2=A0 =C2=A0 0.362339] hpet0: 3 comparators, 64-bit 100.000000 MHz c= ounter
> [=C2=A0 =C2=A0 0.661731] rtc_cmos 00:00: alarms up to one day, y3k, 11= 4 bytes nvram, hpet irqs

Conspicuously absent here is a line saying =E2=80=9Cclocksource: Swi= tched to clocksource hpet=E2=80=9D.=C2=A0 That may be worth examining in mo= re detail.

=C2=A0- Jonathan Morton


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