From: Rick Jones <rick.jones2@hp.com>
To: "John W. Linville" <linville@tuxdriver.com>
Cc: bloat@lists.bufferbloat.net
Subject: Re: [Bloat] Random idea in reaction to all the discussion of TCP flavours - timestamps?
Date: Tue, 15 Mar 2011 18:02:47 -0700 [thread overview]
Message-ID: <1300237367.2087.2238.camel@tardy> (raw)
In-Reply-To: <20110316003234.GC28663@tuxdriver.com>
On Tue, 2011-03-15 at 20:32 -0400, John W. Linville wrote:
> On Tue, Mar 15, 2011 at 02:31:59PM -0700, Rick Jones wrote:
> > On Tue, 2011-03-15 at 16:51 -0400, John W. Linville wrote:
> > > On Tue, Mar 15, 2011 at 09:40:06PM +0200, Jonathan Morton wrote:
> > > >
> > > > On 15 Mar, 2011, at 8:31 pm, John W. Linville wrote:
> > > >
> > > > > If you don't throttle _both_
> > > > > the _enqueue_ and the _dequeue_, then you could be keeping a nice,
> > > > > near-empty tx queue on the host and still have a long, bloated queue
> > > > > building at the device.
> > > >
> > > > Don't devices at least let you query how full their queue is?
> > >
> > > I suppose it depends on what you mean? Presumably drivers know that,
> > > or at least can figure it out. The accuracy of that might depend on
> > > the exact mechanism, how often the tx rings are replinished, etc.
> > >
> > > However, I'm not aware of any API that would let something in the
> > > stack (e.g. a qdisc) query the device driver for the current device
> > > queue depth. At least, I don't think Linux has one -- do other
> > > kernels/stacks provide that?
> >
> > HP-UX's lanadmin (and I presume the nwmgr command in 11.31) command will
> > display the "classic" interface MIB stats, which includes the outbound
> > queue length. What it does (or should do) for that statistic in the
> > face of a multi-queue device I've no idea :)
>
> But that is capacity, right? Not current occupancy? I thought that
> was the outcome of an earlier thread?
No, HP-UX shows current occupancy on its interfaces. I think it is
Cisco which shows capacity - at least that is my recollection of one of
the other discussions.
rick
next prev parent reply other threads:[~2011-03-16 1:02 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-15 10:36 Jim Gettys
2011-03-15 14:40 ` Jim Gettys
2011-03-15 16:47 ` Jonathan Morton
2011-03-15 17:59 ` Don Marti
2011-03-15 18:14 ` Rick Jones
2011-03-15 18:31 ` John W. Linville
2011-03-15 19:40 ` Jonathan Morton
2011-03-15 19:59 ` Rick Jones
2011-03-15 20:51 ` John W. Linville
2011-03-15 21:31 ` Rick Jones
2011-03-16 0:32 ` John W. Linville
2011-03-16 1:02 ` Rick Jones [this message]
2011-03-15 22:01 ` Jonathan Morton
2011-03-15 22:19 ` Stephen Hemminger
2011-03-15 22:26 ` Jonathan Morton
2011-03-15 22:36 ` Rick Jones
2011-03-15 22:40 ` Jonathan Morton
2011-03-15 22:42 ` Stephen Hemminger
2011-03-15 22:52 ` Eric Dumazet
2011-03-15 23:02 ` Rick Jones
2011-03-15 23:12 ` Jonathan Morton
2011-03-15 23:25 ` Rick Jones
2011-03-15 23:33 ` Jonathan Morton
2011-03-15 23:46 ` Dave Täht
2011-03-16 0:49 ` Jonathan Morton
2011-03-16 1:02 ` Dave Täht
2011-03-16 1:28 ` Jonathan Morton
2011-03-16 1:59 ` Dave Täht
2011-03-16 2:23 ` Jonathan Morton
2011-03-16 22:22 ` [Bloat] Random idea in reaction to all the discussion of TCPflavours " Richard Scheffenegger
2011-03-16 23:38 ` richard
2011-03-16 23:50 ` Rick Jones
2011-03-17 12:05 ` Fred Baker
2011-03-17 12:18 ` Fred Baker
2011-03-17 17:27 ` Dave Täht
2011-03-18 18:30 ` Richard Scheffenegger
2011-03-18 18:49 ` Fred Baker
2011-03-20 11:40 ` Jonathan Morton
2011-03-20 22:18 ` david
2011-03-20 22:45 ` Jonathan Morton
2011-03-20 22:50 ` Dave Täht
2011-03-20 22:55 ` grenville armitage
2011-03-20 23:04 ` Dave Täht
2011-03-20 23:14 ` Jonathan Morton
2011-03-20 23:19 ` Dave Täht
2011-03-20 23:23 ` Dave Täht
2011-03-20 22:58 ` Jonathan Morton
2011-03-21 1:28 ` david
2011-03-21 1:56 ` Wesley Eddy
2011-03-18 18:27 ` [Bloat] Random idea in reaction to all the discussion ofTCPflavours " Richard Scheffenegger
2011-03-16 22:07 ` [Bloat] Random idea in reaction to all the discussion of TCPflavours " Richard Scheffenegger
2011-03-17 0:10 ` Jonathan Morton
2011-03-16 0:47 ` [Bloat] Random idea in reaction to all the discussion of TCP flavours " John W. Linville
2011-03-16 20:07 ` Jim Gettys
2011-03-17 2:26 ` Jonathan Morton
2011-03-17 18:22 ` Rick Jones
2011-03-17 21:50 ` Jonathan Morton
2011-03-17 22:20 ` Rick Jones
2011-03-17 22:56 ` Jonathan Morton
2011-03-18 1:36 ` Justin McCann
2011-03-18 5:51 ` Eric Dumazet
2011-03-15 16:34 ` Jonathan Morton
2011-03-15 18:13 ` Stephen Hemminger
2011-03-16 5:41 ` Fred Baker
2011-03-16 6:26 ` Jonathan Morton
2011-03-16 8:55 ` [Bloat] Random idea in reaction to all the discussion of TCPflavours " Richard Scheffenegger
2011-03-16 9:04 ` [Bloat] Random idea in reaction to all the discussion of TCP flavours " BeckW
2011-03-16 22:48 ` Fred Baker
2011-03-16 23:23 ` Jonathan Morton
2011-03-17 8:34 ` BeckW
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