From: Jan Kara <jack@suse.cz>
To: Chris Mason <clm@fb.com>
Cc: ksummit-discuss@lists.linuxfoundation.org
Subject: Re: [Ksummit-discuss] [TOPIC] Application performance: regressions, controlling preemption
Date: Mon, 12 May 2014 17:57:01 +0200 [thread overview]
Message-ID: <20140512155701.GC3685@quack.suse.cz> (raw)
In-Reply-To: <5370DB7B.2040706@fb.com>
Hello,
On Mon 12-05-14 10:32:27, Chris Mason wrote:
> We're in the middle of upgrading the tiers here from older kernels
> (2.6.38, 3.2) into 3.10 and higher.
>
> I've been doing this upgrade game for a number of years now, with
> different business cards taped to my forehead and with different
> target workloads.
>
> The result is always the same...if I'm really lucky the system isn't
> slower, but usually I'm left with a steaming pile of 10-30%
> regressions.
I'd be interested in this discussion as well. We are in a similar
situation in SUSE now when moving our enterprise kernel from 3.0 to 3.12
base. So me, Jiri Kosina, or Mel Gorman can fill in things we found and you
didn't ;) Plus we are slowly working on setting up some more systematic and
continuous way of tracking performance in kernels so sharing experiences
with what is useful to run would be interesting as well.
Honza
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR
next prev parent reply other threads:[~2014-05-12 15:57 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-12 14:32 Chris Mason
2014-05-12 15:05 ` Davidlohr Bueso
2014-05-12 15:57 ` Jan Kara [this message]
2014-05-12 16:18 ` Andy Lutomirski
2014-05-12 23:16 ` Greg KH
2014-05-13 1:43 ` Chris Mason
2014-05-14 1:31 ` Li Zefan
2014-05-14 12:27 ` Chris Mason
2014-05-13 12:27 ` Jan Kara
2014-05-12 23:54 ` Josh Triplett
2014-05-13 0:31 ` Davidlohr Bueso
2014-08-14 15:01 ` Fengguang Wu
2014-08-14 17:17 ` Christoph Lameter
2014-08-15 4:13 ` Fengguang Wu
2014-08-15 14:07 ` Christoph Lameter
2014-08-16 1:32 ` [Ksummit-discuss] 0day kernel performance/power test service Fengguang Wu
2014-05-28 17:08 ` [Ksummit-discuss] [TOPIC] Application performance: regressions, controlling preemption Paul E. McKenney
2014-08-18 6:21 ` Fengguang Wu
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