From: Stephen Hemminger <shemminger@vyatta.com>
To: "John A. Sullivan III" <jsullivan@opensourcedevel.com>
Cc: David Laight <David.Laight@ACULAB.COM>,
netdev@vger.kernel.org, Rick Jones <rick.jones2@hp.com>,
Dave Taht <dave.taht@gmail.com>,
Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: Latency difference between fifo and pfifo_fast
Date: Wed, 7 Dec 2011 15:49:07 -0800 [thread overview]
Message-ID: <20111207154907.462846cb@nehalam.linuxnetplumber.net> (raw)
In-Reply-To: <88e4825e-4efe-4163-bb24-299a20aab66d@jasiiieee>
=
> > Is this a shared network? TOS won't matter if it is only your
> > traffic.
> >
> > There are number of route metrics that you can tweak to that can
> > reduce TCP slow
> > start effects, like increasing the initial cwnd, etc.
> >
> It is a private network dedicated only to SAN traffic - a couple of SAN devices and some virtualization hosts - John
Therefore unless your switch is shared, playing with queueing and TOS
won't help reduce absolute latency.
You maybe able to prioritize one host or SAN over another though.
next prev parent reply other threads:[~2011-12-07 23:49 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <8f05fdb0-6e4c-4adf-b8d1-bd67a0dc114f@jasiiieee>
2011-12-06 4:10 ` Latency difference between fifo and pfifo_fast John A. Sullivan III
2011-12-06 6:02 ` Eric Dumazet
2011-12-06 6:29 ` Eric Dumazet
2011-12-06 8:39 ` John A. Sullivan III
2011-12-06 8:51 ` Eric Dumazet
2011-12-06 18:20 ` Rick Jones
2011-12-06 18:39 ` Dave Taht
2011-12-06 19:44 ` John A. Sullivan III
2011-12-07 13:04 ` Eric Dumazet
2011-12-07 13:27 ` Dave Taht
2011-12-07 14:08 ` David Laight
2011-12-08 0:05 ` John A. Sullivan III
2011-12-07 23:27 ` Stephen Hemminger
2011-12-08 0:34 ` John A. Sullivan III
2011-12-07 23:49 ` Stephen Hemminger [this message]
2011-12-08 3:20 ` John A. Sullivan III
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