linux-kernel - Re: [PATCH] mm readahead: Fix sys_readahead breakage by reverting 2MB limit (bug 79111)

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Message-ID: <20140703190506.GA24683@redhat.com>
Date:	Thu, 3 Jul 2014 15:05:06 -0400
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	David Cohen <david.a.cohen@...ux.intel.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Damien Ramonda <damien.ramonda@...el.com>,
	Jan Kara <jack@...e.cz>, David Rientjes <rientjes@...gle.com>,
	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm readahead: Fix sys_readahead breakage by reverting
 2MB limit (bug 79111)

On Thu, Jul 03, 2014 at 11:53:57AM -0700, Linus Torvalds wrote:
 > On Thu, Jul 3, 2014 at 11:38 AM, Raghavendra K T
 > <raghavendra.kt@...ux.vnet.ibm.com> wrote:
 > >
 > > Okay, how about something like 256MB? I would be happy to send a patch
 > > for that change.
 > 
 > I'd like to see some performance numbers. I know at least Fedora uses
 > "readahead()" in the startup scripts, do we have any performance
 > numbers for that?

this got rolled up into systemd a while ago, so it's not just Fedora.

re: numbers, systemd-analyze and systemd-bootchart look like the way
to figure that out..
https://wiki.archlinux.org/index.php/Improve_boot_performance

	Dave

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