Date: Thu, 19 Mar 2015 20:26:56 -0400 From: Mike Tancsa <mike@sentex.net> To: John-Mark Gurney <jmg@funkthat.com> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: 35-40% performance drop releng9 vs releng10 openvpn Message-ID: <550B6950.8060806@sentex.net> In-Reply-To: <20150318211457.GL51048@funkthat.com> References: <5506250A.2000506@sentex.net> <20150316132055.GQ32288@funkthat.com> <5509D6C6.4050204@sentex.net> <20150318211457.GL51048@funkthat.com>
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On 3/18/2015 5:14 PM, John-Mark Gurney wrote:
> # dtrace -x stackframes=100 -n 'profile-997 /arg0/ { @[stack()] = count(); } tick-60s { exit(0); }' -o out.kern_stacks
>
> Also, another thing you can do is to compare the two using differential
> flame graphs:
> http://www.brendangregg.com/blog/2014-11-09/differential-flame-graphs.html
>
> Which will highlight where the performances differ...
OK, some more data points. It seems a performance regression happened
in RELENG_10 somewhere between r277684 (late January 2015) and now.
Using r277684 on RELENG_10, I can get about 75Mb/s of throughput on
OpenVPN. Still not as good as the 83-85Mb on RELENG_9, but much better
than the 61Mb using RELENG_10 from the start of this week,
For the differential graph, see
http://tancsa.com/diffgraph.svg
and
http://tancsa.com/10-r277684.svg
http://tancsa.com/10-r277684-kern.svg
---Mike
--
-------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications, mike@sentex.net
Providing Internet services since 1994 www.sentex.net
Cambridge, Ontario Canada http://www.tancsa.com/
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