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From: "David S. Miller" <davem@davemloft.net>
To: ak@suse.de
Cc: paulmck@us.ibm.com, dada1@cosmosbay.com,
	alan@lxorguk.ukuu.org.uk, torvalds@osdl.org,
	linux-kernel@vger.kernel.org, dipankar@in.ibm.com,
	manfred@colorfullife.com, netdev@vger.kernel.org
Subject: Re: [PATCH, RFC] RCU : OOM avoidance and lower latency
Date: Fri, 06 Jan 2006 23:10:54 -0800 (PST)
Message-ID: <20060106.231054.43576567.davem@davemloft.net> (raw)
In-Reply-To: <200601070209.02157.ak@suse.de>

From: Andi Kleen <ak@suse.de>
Date: Sat, 7 Jan 2006 02:09:01 +0100

> I always disliked the per chain spinlocks even for other hash tables like
> TCP/UDP multiplex - it would be much nicer to use a much smaller separately 
> hashed lock table and save cache. In this case the special case of using
> a one entry only lock hash table makes sense.

I used to think they were a great technique.  But in each case I
thought they could be applied, better schemes have come along.
In the case of the page cache we went to a per-address-space tree,
and here in the routing cache we went to RCU.

There are RCU patches around for the TCP hashes and I'd like to
put those in at some point as well.  In fact, they'd be even
more far reaching since Arnaldo abstracted away the socket
hashing stuff into an inet_hashtables subsystem.

  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20060105235845.967478000@sorel.sous-sol.org>
2006-01-05 21:47 ` [PATCH 0/6] -stable review Chris Wright
2006-01-06  0:45   ` [PATCH 1/6] drivers/net/sungem.c: gem_remove_one mustnt be __devexit Chris Wright
2006-01-06  0:45   ` [PATCH 2/6] ieee80211_crypt_tkip depends on NET_RADIO Chris Wright
2006-01-06  0:45   ` [PATCH 3/6] Insanity avoidance in /proc (CVE-2005-4605) Chris Wright
2006-01-06  0:45   ` [PATCH 4/6] sysctl: dont overflow the user-supplied buffer with 0 Chris Wright
2006-01-06  1:30     ` Linus Torvalds
2006-01-06  3:40       ` Chris Wright
2006-01-06 10:17       ` [PATCH, RFC] RCU : OOM avoidance and lower latency Eric Dumazet
2006-01-06 12:52         ` [PATCH, RFC] RCU : OOM avoidance and lower latency (Version 2), HOTPLUG_CPU fix Eric Dumazet
2006-01-06 12:58         ` [PATCH, RFC] RCU : OOM avoidance and lower latency Andi Kleen
2006-01-06 13:09           ` Eric Dumazet
2006-01-06 19:26           ` Lee Revell
2006-01-06 22:18             ` Andi Kleen
2006-01-06 13:37         ` Alan Cox
2006-01-06 14:00           ` Eric Dumazet
2006-01-06 14:45             ` Alan Cox
2006-01-06 16:47           ` Paul E. McKenney
2006-01-06 17:19             ` Eric Dumazet
2006-01-06 20:26               ` Paul E. McKenney
2006-01-06 20:33                 ` David S. Miller
2006-01-06 20:57                 ` Andi Kleen
2006-01-07  0:17                   ` David S. Miller
2006-01-07  1:09                     ` Andi Kleen
2006-01-07  7:10                       ` David S. Miller [this message]
2006-01-07  7:34                       ` Eric Dumazet
2006-01-07  7:44                         ` David S. Miller
2006-01-07  7:53                           ` Eric Dumazet
2006-01-07  8:36                             ` David S. Miller
2006-01-07 20:30                               ` Paul E. McKenney
2006-01-07  8:30                     ` Eric Dumazet
2006-01-06 19:24         ` Lee Revell
2006-01-06  0:46   ` [PATCH 5/6] UFS: inode->i_sem is not released in error path Chris Wright
2006-01-06  0:46   ` [PATCH 6/6] [ATYFB]: Fix onboard video on SPARC Blade 100 for 2.6.{13,14,15} Chris Wright
2006-01-06  0:53   ` [PATCH 0/6] -stable review Chris Wright

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