From: David Miller <davem@davemloft.net>
To: linas@austin.ibm.com
Cc: arnd@arndb.de, jklewis@us.ibm.com, linux-kernel@vger.kernel.org,
linuxppc-dev@ozlabs.org, netdev@vger.kernel.org,
Jens.Osterkamp@de.ibm.com
Subject: Re: [PATCH 2/4]: powerpc/cell spidernet low watermark patch.
Date: Fri, 18 Aug 2006 14:25:13 -0700 (PDT) [thread overview]
Message-ID: <20060818.142513.29571851.davem@davemloft.net> (raw)
In-Reply-To: <20060818192356.GD26889@austin.ibm.com>
From: linas@austin.ibm.com (Linas Vepstas)
Date: Fri, 18 Aug 2006 14:23:56 -0500
> On Thu, Aug 17, 2006 at 01:43:40AM +0200, Benjamin Herrenschmidt wrote:
> >
> > Sounds good (without actually looking at the code though :), that was a
> > long required improvement to that driver. Also, we should probably look
> > into using NAPI polling for tx completion queue as well, no ?
>
> Just for a lark, I tried using NAPI polling, while disabling all TX
> interrupts. Performance was a disaster: 8Mbits/sec, fom which I conclude
> that the tcp ack packets do not flow back fast enough to allw reliance
> on NAPI polling for transmit.
The idea is to use NAPI polling with TX interrupts disabled.
We're not saying to use the RX interrupt as the trigger for
RX and TX work. Rather, either of RX or TX interrupt will
schedule the NAPI poll.
next prev parent reply other threads:[~2006-08-18 21:25 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-11 17:03 [PATCH 0/4]: powerpc/cell spidernet ethernet driver fixes Linas Vepstas
2006-08-11 17:06 ` [PATCH 1/4]: powerpc/cell spidernet burst alignment patch Linas Vepstas
2006-08-11 17:08 ` [PATCH 2/4]: powerpc/cell spidernet low watermark patch Linas Vepstas
2006-08-16 23:43 ` Benjamin Herrenschmidt
2006-08-18 19:23 ` Linas Vepstas
2006-08-18 21:25 ` David Miller [this message]
2006-08-18 22:46 ` Linas Vepstas
2006-08-18 22:51 ` David Miller
2006-08-18 23:29 ` Linas Vepstas
2006-08-18 23:45 ` Linas Vepstas
2006-08-19 4:33 ` Benjamin Herrenschmidt
2006-08-22 0:13 ` Linas Vepstas
2006-08-22 0:30 ` David Miller
2006-08-19 4:31 ` Benjamin Herrenschmidt
2006-08-11 17:09 ` [PATCH 3/4]: powerpc/cell spidernet stop error printing patch Linas Vepstas
2006-08-11 17:11 ` [PATCH 4/4]: powerpc/cell spidernet ethtool -i version number info Linas Vepstas
2006-08-11 18:00 ` Olof Johansson
2006-08-11 18:50 ` James K Lewis
2006-08-11 19:46 ` Linas Vepstas
2006-08-15 19:05 ` Olof Johansson
2006-08-16 0:29 ` Michael Ellerman
2006-08-11 17:42 ` [PATCH 0/4]: powerpc/cell spidernet ethernet driver fixes jschopp
2006-08-11 17:44 ` Sam Ravnborg
2006-08-11 19:31 ` Linas Vepstas
2006-08-11 20:27 ` Arnd Bergmann
2006-08-16 16:18 ` [PATCH 1/2]: powerpc/cell spidernet bottom half Linas Vepstas
2006-08-16 16:30 ` Jeff Garzik
2006-08-16 20:30 ` Linas Vepstas
2006-08-16 20:34 ` Jeff Garzik
2006-08-16 20:46 ` David Miller
2006-08-16 21:24 ` Arnd Bergmann
2006-08-16 21:32 ` David Miller
2006-08-16 22:16 ` Arnd Bergmann
2006-08-16 22:29 ` David Miller
2006-08-16 22:47 ` Arnd Bergmann
2006-08-16 23:30 ` Linas Vepstas
2006-08-16 23:32 ` David Miller
2006-08-17 0:23 ` Linas Vepstas
2006-08-16 23:24 ` Linas Vepstas
2006-08-16 22:55 ` Linas Vepstas
2006-08-16 23:03 ` Arnd Bergmann
2006-08-16 23:47 ` Linas Vepstas
2006-08-16 23:08 ` Rick Jones
2006-08-16 21:58 ` Linas Vepstas
2006-08-16 16:23 ` [PATCH 2/2]: powerpc/cell spidernet refine locking Linas Vepstas
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