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From: David Howells <dhowells@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: dhowells@redhat.com, lkp report check <rong.a.chen@intel.com>,
	Rasmus Villemoes <linux@rasmusvillemoes.dk>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Nicolas Dichtel <nicolas.dichtel@6wind.com>,
	raven@themaw.net, Christian Brauner <christian@brauner.io>,
	keyrings@vger.kernel.org, linux-usb@vger.kernel.org,
	linux-block <linux-block@vger.kernel.org>,
	LSM List <linux-security-module@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Linux API <linux-api@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	lkp@lists.01.org
Subject: Re: [pipe] d60337eff1: phoronix-test-suite.noise-level.0.activity_level 144.0% improvement
Date: Thu, 07 Nov 2019 17:42:18 +0000
Message-ID: <25252.1573148538@warthog.procyon.org.uk> (raw)
In-Reply-To: <CAHk-=wiJ+jaT5Ev-wCg7iGNNO_JFUyMDcat0KDdA2b_+n_cZCQ@mail.gmail.com>

Linus Torvalds <torvalds@linux-foundation.org> wrote:

> > FYI, we noticed a 144.0% improvement of phoronix-test-suite.noise-level.0.activity_level due to commit:
> >
> > commit: d60337eff18a3c587832ab8053a567f1da9710d2 ("[RFC PATCH 04/11] pipe: Use head and tail pointers for the ring, not cursor and length [ver #3]")
> 
> That sounds nice, but is odd. That commit really shouldn't change
> anything noticeable. David, any idea?

Yeah, it does sound odd - the only thing that springs particularly to mind is
that maybe it's an effect of one of the preceding patches that affects the
waitqueue stuff.

TBH, I'm not sure what the Phoronix test suite is actually testing from the
report.  "noise-level-1.1.0" seems more a reporting script than an actual
test.

David


  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-01 17:34 [RFC PATCH 00/11] pipe: Notification queue preparation [ver #3] David Howells
2019-11-01 17:34 ` [RFC PATCH 01/11] pipe: Reduce #inclusion of pipe_fs_i.h " David Howells
2019-11-01 17:34 ` [RFC PATCH 02/11] Remove the nr_exclusive argument from __wake_up_sync_key() " David Howells
2019-11-01 17:34 ` [RFC PATCH 03/11] Add wake_up_interruptible_sync_poll_locked() " David Howells
2019-11-01 17:34 ` [RFC PATCH 04/11] pipe: Use head and tail pointers for the ring, not cursor and length " David Howells
     [not found]   ` <20191107090306.GV29418@shao2-debian>
2019-11-07 16:51     ` [pipe] d60337eff1: phoronix-test-suite.noise-level.0.activity_level 144.0% improvement Linus Torvalds
2019-11-07 17:42     ` David Howells [this message]
2019-11-01 17:34 ` [RFC PATCH 05/11] pipe: Allow pipes to have kernel-reserved slots [ver #3] David Howells
2019-11-01 17:34 ` [RFC PATCH 06/11] pipe: Advance tail pointer inside of wait spinlock in pipe_read() " David Howells
2019-11-01 17:35 ` [RFC PATCH 07/11] pipe: Conditionalise wakeup " David Howells
2019-11-01 17:35 ` [RFC PATCH 08/11] pipe: Rearrange sequence in pipe_write() to preallocate slot " David Howells
2019-11-01 17:35 ` [RFC PATCH 09/11] pipe: Remove redundant wakeup from pipe_write() " David Howells
2019-11-01 17:35 ` [RFC PATCH 10/11] pipe: Check for ring full inside of the spinlock in " David Howells
2019-11-01 17:35 ` [RFC PATCH 11/11] pipe: Increase the writer-wakeup threshold to reduce context-switch count " David Howells
2019-11-01 19:24 ` [RFC PATCH 00/11] pipe: Notification queue preparation " Linus Torvalds
2019-11-01 22:05 ` David Howells
2019-11-01 22:12   ` Linus Torvalds
2019-11-05 16:02 ` Details on the UAPI of implementing notifications on pipes David Howells

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