From: linas@austin.ibm.com (Linas Vepstas)
To: Stephen Hemminger <shemminger@linux-foundation.org>
Cc: Thomas Klein <tklein@de.ibm.com>,
Jan-Bernd Themann <themann@de.ibm.com>,
netdev <netdev@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Christoph Raisch <raisch@de.ibm.com>,
linux-ppc <linuxppc-dev@ozlabs.org>,
Jan-Bernd Themann <ossthema@de.ibm.com>, Eder <meder@de.ibm.com>,
akepner@sgi.com, Stefan Roscher <stefan.roscher@de.ibm.com>,
Marcus@ozlabs.org
Subject: Re: RFC: issues concerning the next NAPI interface
Date: Fri, 24 Aug 2007 11:51:10 -0500 [thread overview]
Message-ID: <20070824165110.GH4282@austin.ibm.com> (raw)
In-Reply-To: <20070824085203.42f4305c@freepuppy.rosehill.hemminger.net>
On Fri, Aug 24, 2007 at 08:52:03AM -0700, Stephen Hemminger wrote:
>
> You need hardware support for deferred interrupts. Most devices have it (e1000, sky2, tg3)
> and it interacts well with NAPI. It is not a generic thing you want done by the stack,
> you want the hardware to hold off interrupts until X packets or Y usecs have expired.
Just to be clear, in the previous email I posted on this thread, I
described a worst-case network ping-pong test case (send a packet, wait
for reply), and found out that a deffered interrupt scheme just damaged
the performance of the test case. Since the folks who came up with the
test case were adamant, I turned off the defferred interrupts.
While defferred interrupts are an "obvious" solution, I decided that
they weren't a good solution. (And I have no other solution to offer).
--linas
WARNING: multiple messages have this Message-ID (diff)
From: linas@austin.ibm.com (Linas Vepstas)
To: Stephen Hemminger <shemminger@linux-foundation.org>
Cc: Jan-Bernd Themann <ossthema@de.ibm.com>,
Thomas Klein <tklein@de.ibm.com>,
Marcus@ozlabs.org, Jan-Bernd Themann <themann@de.ibm.com>,
netdev <netdev@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Christoph Raisch <raisch@de.ibm.com>,
linux-ppc <linuxppc-dev@ozlabs.org>,
akepner@sgi.com, Eder <meder@de.ibm.com>,
Stefan Roscher <stefan.roscher@de.ibm.com>
Subject: Re: RFC: issues concerning the next NAPI interface
Date: Fri, 24 Aug 2007 11:51:10 -0500 [thread overview]
Message-ID: <20070824165110.GH4282@austin.ibm.com> (raw)
In-Reply-To: <20070824085203.42f4305c@freepuppy.rosehill.hemminger.net>
On Fri, Aug 24, 2007 at 08:52:03AM -0700, Stephen Hemminger wrote:
>
> You need hardware support for deferred interrupts. Most devices have it (e1000, sky2, tg3)
> and it interacts well with NAPI. It is not a generic thing you want done by the stack,
> you want the hardware to hold off interrupts until X packets or Y usecs have expired.
Just to be clear, in the previous email I posted on this thread, I
described a worst-case network ping-pong test case (send a packet, wait
for reply), and found out that a deffered interrupt scheme just damaged
the performance of the test case. Since the folks who came up with the
test case were adamant, I turned off the defferred interrupts.
While defferred interrupts are an "obvious" solution, I decided that
they weren't a good solution. (And I have no other solution to offer).
--linas
next prev parent reply other threads:[~2007-08-24 16:51 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-24 13:59 RFC: issues concerning the next NAPI interface Jan-Bernd Themann
2007-08-24 13:59 ` Jan-Bernd Themann
2007-08-24 15:37 ` akepner
2007-08-24 15:37 ` akepner
2007-08-24 15:47 ` Jan-Bernd Themann
2007-08-24 15:47 ` Jan-Bernd Themann
2007-08-24 15:52 ` Stephen Hemminger
2007-08-24 15:52 ` Stephen Hemminger
2007-08-24 16:50 ` David Stevens
2007-08-24 16:50 ` David Stevens
2007-08-24 21:44 ` David Miller
2007-08-24 21:44 ` David Miller
2007-08-24 21:51 ` Linas Vepstas
2007-08-24 21:51 ` Linas Vepstas
2007-08-24 16:51 ` Linas Vepstas [this message]
2007-08-24 16:51 ` Linas Vepstas
2007-08-24 17:07 ` Rick Jones
2007-08-24 17:07 ` Rick Jones
2007-08-24 17:45 ` Shirley Ma
2007-08-24 17:45 ` Shirley Ma
2007-08-24 17:16 ` James Chapman
2007-08-24 17:16 ` James Chapman
2007-08-24 18:11 ` Jan-Bernd Themann
2007-08-24 18:11 ` Jan-Bernd Themann
2007-08-24 21:47 ` David Miller
2007-08-24 21:47 ` David Miller
2007-08-24 22:06 ` akepner
2007-08-24 22:06 ` akepner
2007-08-26 19:36 ` James Chapman
2007-08-26 19:36 ` James Chapman
2007-08-27 1:58 ` David Miller
2007-08-27 1:58 ` David Miller
2007-08-27 9:47 ` Jan-Bernd Themann
2007-08-27 9:47 ` Jan-Bernd Themann
2007-08-27 20:37 ` David Miller
2007-08-27 20:37 ` David Miller
2007-08-28 11:19 ` Jan-Bernd Themann
2007-08-28 11:19 ` Jan-Bernd Themann
2007-08-28 20:21 ` David Miller
2007-08-28 20:21 ` David Miller
2007-08-29 7:10 ` Jan-Bernd Themann
2007-08-29 7:10 ` Jan-Bernd Themann
2007-08-29 8:15 ` James Chapman
2007-08-29 8:15 ` James Chapman
2007-08-29 8:43 ` Jan-Bernd Themann
2007-08-29 8:43 ` Jan-Bernd Themann
2007-08-29 8:29 ` David Miller
2007-08-29 8:29 ` David Miller
2007-08-29 8:31 ` Jan-Bernd Themann
2007-08-29 8:31 ` Jan-Bernd Themann
2007-08-27 15:51 ` James Chapman
2007-08-27 15:51 ` James Chapman
2007-08-27 16:02 ` Jan-Bernd Themann
2007-08-27 16:02 ` Jan-Bernd Themann
2007-08-27 17:05 ` James Chapman
2007-08-27 17:05 ` James Chapman
2007-08-27 21:02 ` David Miller
2007-08-27 21:02 ` David Miller
2007-08-27 21:41 ` James Chapman
2007-08-27 21:41 ` James Chapman
2007-08-27 21:56 ` David Miller
2007-08-27 21:56 ` David Miller
2007-08-28 9:22 ` James Chapman
2007-08-28 9:22 ` James Chapman
2007-08-28 11:48 ` Jan-Bernd Themann
2007-08-28 11:48 ` Jan-Bernd Themann
2007-08-28 12:16 ` Evgeniy Polyakov
2007-08-28 12:16 ` Evgeniy Polyakov
2007-08-28 14:55 ` James Chapman
2007-08-28 14:55 ` James Chapman
2007-08-28 11:21 ` Jan-Bernd Themann
2007-08-28 11:21 ` Jan-Bernd Themann
2007-08-28 20:25 ` David Miller
2007-08-28 20:25 ` David Miller
2007-08-28 20:27 ` David Miller
2007-08-28 20:27 ` David Miller
2007-08-24 16:45 ` Linas Vepstas
2007-08-24 16:45 ` Linas Vepstas
2007-08-24 21:43 ` David Miller
2007-08-24 21:43 ` David Miller
2007-08-24 21:32 ` David Miller
2007-08-24 21:32 ` David Miller
2007-08-24 21:37 ` David Miller
2007-08-24 21:37 ` David Miller
[not found] <8VHRR-45R-17@gated-at.bofh.it>
[not found] ` <8VKwj-8ke-27@gated-at.bofh.it>
2007-08-24 19:04 ` Bodo Eggert
2007-08-24 19:04 ` Bodo Eggert
2007-08-24 20:42 ` Linas Vepstas
2007-08-24 20:42 ` Linas Vepstas
2007-08-24 21:11 ` Jan-Bernd Themann
2007-08-24 21:11 ` Jan-Bernd Themann
2007-08-24 21:35 ` Linas Vepstas
2007-08-24 21:35 ` Linas Vepstas
[not found] ` <E1IOeSm-0000bm-Jo__24045.532072387$1187982363$gmane$org@be1.lrz>
2007-08-24 20:24 ` Stephen Hemminger
-- strict thread matches above, loose matches on Subject: below --
2007-08-25 2:10 Mitchell Erblich
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