From: Fred Baker <fred@cisco.com>
To: rick.jones2@hp.com
Cc: Stephen Hemminger <shemminger@vyatta.com>, bloat@lists.bufferbloat.net
Subject: Re: [Bloat] Burst Loss
Date: Thu, 12 May 2011 09:31:03 -0700 [thread overview]
Message-ID: <4DD9A464-8845-49AA-ADC4-A0D36D91AAEC@cisco.com> (raw)
In-Reply-To: <1304964368.8149.202.camel@tardy>
On May 9, 2011, at 11:06 AM, Rick Jones wrote:
> GSO/TSO can be thought of as a symptom of standards bodies (eg the IEEE)
> refusing to standardize an increase in frame sizes. Put another way,
> they are a "poor man's jumbo frames."
I'll agree, but only half; once the packets are transferred on the local wire, any jumbo-ness is lost. GSO/TSO mostly squeezes interframe gaps out of the wire and perhaps limits the amount of work the driver has to do. The real value of an end to end (IP) jumbo frame is that the receiving system experiences less interrupt load - a 9K frame replaces half a dozen 1500 byte frames, and as a result the receiver experiences 1/5 or 1/6 of the interrupts. Given that it has to save state, activate the kernel thread, and at least enqueue and perhaps acknowledge the received message, reducing interrupt load on the receiver makes it far more effective. This has the greatest effect on multi-gigabit file transfers.
next prev parent reply other threads:[~2011-05-12 16:23 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-26 17:05 [Bloat] Network computing article on bloat Dave Taht
2011-04-26 18:13 ` Dave Hart
2011-04-26 18:17 ` Dave Taht
2011-04-26 18:28 ` dave greenfield
2011-04-26 18:32 ` Wesley Eddy
2011-04-26 19:37 ` Dave Taht
2011-04-26 20:21 ` Wesley Eddy
2011-04-26 20:30 ` Constantine Dovrolis
2011-04-26 21:16 ` Dave Taht
2011-04-27 17:10 ` Bill Sommerfeld
2011-04-27 17:40 ` Wesley Eddy
2011-04-27 7:43 ` Jonathan Morton
2011-04-30 15:56 ` Henrique de Moraes Holschuh
2011-04-30 19:18 ` [Bloat] Goodput fraction w/ AQM vs bufferbloat Richard Scheffenegger
2011-05-05 16:01 ` Jim Gettys
2011-05-05 16:10 ` Stephen Hemminger
2011-05-05 16:30 ` Jim Gettys
2011-05-05 16:49 ` [Bloat] Burst Loss Neil Davies
2011-05-05 18:34 ` Jim Gettys
2011-05-06 11:40 ` Sam Stickland
2011-05-06 11:53 ` Neil Davies
2011-05-08 12:42 ` Richard Scheffenegger
2011-05-09 18:06 ` Rick Jones
2011-05-11 8:53 ` Richard Scheffenegger
2011-05-11 9:53 ` Eric Dumazet
2011-05-12 14:16 ` [Bloat] Publications Richard Scheffenegger
2011-05-12 16:31 ` Fred Baker [this message]
2011-05-12 16:41 ` [Bloat] Burst Loss Rick Jones
2011-05-12 17:11 ` Fred Baker
2011-05-13 5:00 ` Kevin Gross
2011-05-13 14:35 ` Rick Jones
2011-05-13 14:54 ` Dave Taht
2011-05-13 20:03 ` [Bloat] Jumbo frames and LAN buffers (was: RE: Burst Loss) Kevin Gross
2011-05-14 20:48 ` Fred Baker
2011-05-15 18:28 ` Jonathan Morton
2011-05-15 20:49 ` Fred Baker
2011-05-16 0:31 ` Jonathan Morton
2011-05-16 7:51 ` Richard Scheffenegger
2011-05-16 9:49 ` Fred Baker
2011-05-16 11:23 ` [Bloat] Jumbo frames and LAN buffers Jim Gettys
2011-05-16 13:15 ` Kevin Gross
2011-05-16 13:22 ` Jim Gettys
2011-05-16 13:42 ` Kevin Gross
2011-05-16 15:23 ` Jim Gettys
[not found] ` <-854731558634984958@unknownmsgid>
2011-05-16 13:45 ` Dave Taht
2011-05-16 18:36 ` Richard Scheffenegger
2011-05-16 18:11 ` [Bloat] Jumbo frames and LAN buffers (was: RE: Burst Loss) Richard Scheffenegger
2011-05-17 7:49 ` BeckW
2011-05-17 14:16 ` Dave Taht
[not found] ` <-4629065256951087821@unknownmsgid>
2011-05-13 20:21 ` Dave Taht
2011-05-13 22:36 ` Kevin Gross
2011-05-13 22:08 ` [Bloat] Burst Loss david
2011-05-13 19:32 ` Denton Gentry
2011-05-13 20:47 ` Rick Jones
2011-05-06 4:18 ` [Bloat] Goodput fraction w/ AQM vs bufferbloat Fred Baker
2011-05-06 15:14 ` richard
2011-05-06 21:56 ` Fred Baker
2011-05-06 22:10 ` Stephen Hemminger
2011-05-07 16:39 ` Jonathan Morton
2011-05-08 0:15 ` Stephen Hemminger
2011-05-08 3:04 ` Constantine Dovrolis
2011-05-08 13:00 ` Richard Scheffenegger
2011-05-08 12:53 ` Richard Scheffenegger
2011-05-08 12:34 ` Richard Scheffenegger
2011-05-09 3:07 ` Fred Baker
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