From: "David S. Miller" <davem@davemloft.net>
To: ak@muc.de
Cc: netdev@oss.sgi.com
Subject: Re: issue with new TCP TSO stuff
Date: Thu, 12 May 2005 12:26:57 -0700 (PDT) [thread overview]
Message-ID: <20050512.122657.50069962.davem@davemloft.net> (raw)
In-Reply-To: <m1sm0sttvy.fsf@muc.de>
From: Andi Kleen <ak@muc.de>
Subject: Re: issue with new TCP TSO stuff
Date: Thu, 12 May 2005 16:13:05 +0200
> Are you sure a few atomic_inc/dec are really causing noticeable
> slowdown? That would surprise me unless you have lots of cache line
> bouncing on a MP system.
It's about 7 or 8 times as many atomic gets and puts on pages compared
to the older code (with an 8K page size).
Some of it we can't get rid of, because we keep a normal write queue
segmented set of SKBs around.
But the TSO part we can eliminate.
next prev parent reply other threads:[~2005-05-12 19:26 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-12 5:30 issue with new TCP TSO stuff David S. Miller
2005-05-12 10:05 ` Herbert Xu
2005-05-12 20:13 ` David S. Miller
2005-05-12 21:47 ` Herbert Xu
2005-05-12 22:10 ` Herbert Xu
2005-05-12 22:52 ` David S. Miller
2005-05-12 23:10 ` Herbert Xu
2005-05-12 23:24 ` David S. Miller
2005-05-12 23:52 ` Herbert Xu
2005-05-13 4:36 ` David S. Miller
2005-05-13 13:25 ` Herbert Xu
2005-05-12 22:46 ` David S. Miller
2005-05-12 14:13 ` Andi Kleen
2005-05-12 19:26 ` David S. Miller [this message]
[not found] ` <20050512200251.GA72662@muc.de>
2005-05-12 20:03 ` David S. Miller
2005-05-12 20:26 ` Andi Kleen
2005-05-12 22:34 ` David S. Miller
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