linux-kernel - Re: [PATCH] perf record: mmap output file

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Date:	Tue, 15 Oct 2013 09:44:51 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	David Ahern <dsahern@...il.com>, acme@...stprotocols.net,
	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf record: mmap output file - v2


* Namhyung Kim <namhyung@...nel.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
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