From: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
To: Jan-Bernd Themann <ossthema@de.ibm.com>
Cc: James Chapman <jchapman@katalix.com>,
David Miller <davem@davemloft.net>,
shemminger@linux-foundation.org, akepner@sgi.com,
netdev@vger.kernel.org, raisch@de.ibm.com, themann@de.ibm.com,
linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
meder@de.ibm.com, tklein@de.ibm.com, stefan.roscher@de.ibm.com
Subject: Re: RFC: issues concerning the next NAPI interface
Date: Tue, 28 Aug 2007 16:16:19 +0400 [thread overview]
Message-ID: <20070828121617.GA4160@2ka.mipt.ru> (raw)
In-Reply-To: <200708281348.21302.ossthema@de.ibm.com>
On Tue, Aug 28, 2007 at 01:48:20PM +0200, Jan-Bernd Themann (ossthema@de.ibm.com) wrote:
> I'm not sure if I understand your approach correctly.
> This approach may reduce the number of interrupts, but it does so
> by blocking the CPU for up to 1 jiffy (that can be quite some time
> on some platforms). So no other application / tasklet / softIRQ type
> can do anything in between. The CPU utilization does not drop at all,
> and I thought that is one reason why we try to reduce the number of interrupts.
Only NICs interrupts are suposed to be stopped, system will continue to
work as usual, since all others are alive.
Having hrtimer to reshcedule NIC procesing can work only if number of
timer's interrupts are much less than NICs and if rate of the timer's
starts/changes (presumbly in NICs interrupt) is small too, otherwise
having too many NIC interrupts will not gain anything (actually it is
what is supposed to be dropped noticebly).
--
Evgeniy Polyakov
next prev parent reply other threads:[~2007-08-28 12:17 UTC|newest]
Thread overview: 48+ 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 15:37 ` akepner
2007-08-24 15:47 ` Jan-Bernd Themann
2007-08-24 15:52 ` Stephen Hemminger
2007-08-24 16:50 ` David Stevens
2007-08-24 21:44 ` David Miller
2007-08-24 21:51 ` Linas Vepstas
2007-08-24 16:51 ` Linas Vepstas
2007-08-24 17:07 ` Rick Jones
2007-08-24 17:45 ` Shirley Ma
2007-08-24 17:16 ` James Chapman
2007-08-24 18:11 ` Jan-Bernd Themann
2007-08-24 21:47 ` David Miller
2007-08-24 22:06 ` akepner
2007-08-26 19:36 ` James Chapman
2007-08-27 1:58 ` David Miller
2007-08-27 9:47 ` Jan-Bernd Themann
2007-08-27 20:37 ` David Miller
2007-08-28 11:19 ` Jan-Bernd Themann
2007-08-28 20:21 ` David Miller
2007-08-29 7:10 ` Jan-Bernd Themann
2007-08-29 8:15 ` James Chapman
2007-08-29 8:43 ` Jan-Bernd Themann
2007-08-29 8:29 ` David Miller
2007-08-29 8:31 ` Jan-Bernd Themann
2007-08-27 15:51 ` James Chapman
2007-08-27 16:02 ` Jan-Bernd Themann
2007-08-27 17:05 ` James Chapman
2007-08-27 21:02 ` David Miller
2007-08-27 21:41 ` James Chapman
2007-08-27 21:56 ` David Miller
2007-08-28 9:22 ` James Chapman
2007-08-28 11:48 ` Jan-Bernd Themann
2007-08-28 12:16 ` Evgeniy Polyakov [this message]
2007-08-28 14:55 ` James Chapman
2007-08-28 11:21 ` Jan-Bernd Themann
2007-08-28 20:25 ` David Miller
2007-08-28 20:27 ` David Miller
2007-08-24 16:45 ` Linas Vepstas
2007-08-24 21:43 ` David Miller
2007-08-24 21:32 ` 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 20:42 ` Linas Vepstas
2007-08-24 21:11 ` Jan-Bernd Themann
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20070828121617.GA4160@2ka.mipt.ru \
--to=johnpol@2ka.mipt.ru \
--cc=akepner@sgi.com \
--cc=davem@davemloft.net \
--cc=jchapman@katalix.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@ozlabs.org \
--cc=meder@de.ibm.com \
--cc=netdev@vger.kernel.org \
--cc=ossthema@de.ibm.com \
--cc=raisch@de.ibm.com \
--cc=shemminger@linux-foundation.org \
--cc=stefan.roscher@de.ibm.com \
--cc=themann@de.ibm.com \
--cc=tklein@de.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox