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From: Ingo Molnar <mingo@kernel.org>
To: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>,
	acme@ghostprotocols.net, linux-kernel@vger.kernel.org,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Jiri Olsa <jolsa@redhat.com>, Mike Galbraith <efault@gmx.de>,
	Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH] perf record: mmap output file - v2
Date: Tue, 15 Oct 2013 09:44:51 +0200	[thread overview]
Message-ID: <20131015074451.GA28186@gmail.com> (raw)
In-Reply-To: <87txgj9eir.fsf@sejong.aot.lge.com>


* Namhyung Kim <namhyung@kernel.org> wrote:

> [SNIP]
> > +/* mmap file big chunks at a time */
> > +#define MMAP_OUTPUT_SIZE   (64*1024*1024)
> 
> Why did you choose 64MB for the size?  Did you also test other sizes?

Btw., should this value go up if the ring buffer (mmap_pages) is larger 
than 64MB?

Thanks,

	Ingo

  reply	other threads:[~2013-10-15  7:44 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-10-15  2:55 [PATCH] perf record: mmap output file - v2 David Ahern
2013-10-15  6:02 ` Ingo Molnar
2013-10-15  7:09   ` Namhyung Kim
2013-10-15  7:25     ` Ingo Molnar
2013-10-15  8:17       ` Namhyung Kim
2013-10-15 12:22       ` Jiri Olsa
2013-10-15 13:20         ` Ingo Molnar
2013-10-15 13:25     ` David Ahern
2013-10-16  1:24       ` Namhyung Kim
2013-10-15  7:31 ` Namhyung Kim
2013-10-15  7:44   ` Ingo Molnar [this message]
2013-10-15 13:45     ` David Ahern
2013-10-15 13:35   ` David Ahern
2013-10-16  1:52     ` Namhyung Kim
2013-10-16  1:58       ` David Ahern

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