From: Robert Olsson <Robert.Olsson@data.slu.se>
To: Stephen Hemminger <shemminger@osdl.org>
Cc: Robert Olsson <Robert.Olsson@data.slu.se>,
hadi@cyberus.ca, Herbert Xu <herbert@gondor.apana.org.au>,
netdev@vger.kernel.org, jgarzik@pobox.com, mchan@broadcom.com,
David Miller <davem@davemloft.net>, Andi Kleen <ak@suse.de>
Subject: Re: netif_tx_disable and lockless TX
Date: Fri, 2 Jun 2006 12:46:35 +0200 [thread overview]
Message-ID: <17536.5899.786413.547480@robur.slu.se> (raw)
In-Reply-To: <447FAFAD.9000503@osdl.org>
Stephen Hemminger writes:
> I also noticed that you really don't save much by doing TX cleaning at
> hardirq, because in hardirq you need to do dev_kfree_irq and that causes
> a softirq (for the routing case where users=1). So when routing it
> doesn't make much difference, both methods cause the softirq delayed
> processing to be invoked. For locally generated packets which are
> cloned, the hardirq will drop the ref count, and that is faster than
> doing the whole softirq round trip.
Right. Also the other way around, repeated ->poll can avoid TX hardirq's.
Cheers.
--ro
next prev parent reply other threads:[~2006-06-02 10:47 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-31 4:51 netif_tx_disable and lockless TX Michael Chan
2006-05-31 4:58 ` Herbert Xu
2006-05-31 5:11 ` David Miller
2006-05-31 5:14 ` Herbert Xu
2006-05-31 6:26 ` David Miller
2006-05-31 6:31 ` Herbert Xu
2006-05-31 7:08 ` David Miller
2006-05-31 12:06 ` Herbert Xu
2006-05-31 12:36 ` jamal
2006-05-31 12:40 ` Herbert Xu
2006-05-31 13:03 ` jamal
2006-05-31 17:52 ` Robert Olsson
2006-06-02 3:25 ` Stephen Hemminger
2006-06-02 10:46 ` Robert Olsson [this message]
2006-06-14 12:52 ` jamal
2006-05-31 21:20 ` Michael Chan
2006-06-01 0:09 ` David Miller
2006-06-01 0:25 ` Herbert Xu
2006-05-31 23:01 ` Michael Chan
2006-06-01 0:42 ` Herbert Xu
2006-06-01 0:27 ` Michael Chan
2006-06-01 2:27 ` Herbert Xu
2006-06-01 11:15 ` [NET]: Add netif_tx_lock Herbert Xu
2006-06-06 4:32 ` David Miller
2006-06-06 4:44 ` Roland Dreier
2006-06-06 4:50 ` Roland Dreier
2006-06-06 4:57 ` Roland Dreier
2006-06-06 5:10 ` David Miller
2006-06-06 6:01 ` Roland Dreier
2006-06-06 4:58 ` David Miller
2006-06-06 5:04 ` Roland Dreier
2006-06-06 5:09 ` David Miller
2006-06-06 4:57 ` David Miller
2006-06-06 10:22 ` Herbert Xu
2006-06-09 5:48 ` Herbert Xu
2006-06-09 19:21 ` David Miller
-- strict thread matches above, loose matches on Subject: below --
2006-05-31 5:30 netif_tx_disable and lockless TX Michael Chan
2006-05-31 5:33 ` Herbert Xu
2006-05-31 4:03 Herbert Xu
2006-05-31 4:13 ` David Miller
2006-05-31 4:17 ` Herbert Xu
2006-05-31 4:13 ` Roland Dreier
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