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From: Ravikiran G Thirumalai <kiran@scalex86.org>
To: "David S. Miller" <davem@davemloft.net>
Cc: akpm@osdl.org, linux-kernel@vger.kernel.org, dipankar@in.ibm.com,
	bharata@in.ibm.com, shai@scalex86.org, rusty@rustcorp.com.au,
	netdev@vger.kernel.org
Subject: Re: [patch 9/11] net: dst_entry.refcount, use, lastuse to use alloc_percpu
Date: Tue, 13 Sep 2005 16:17:17 -0700	[thread overview]
Message-ID: <20050913231717.GC6249@localhost.localdomain> (raw)
In-Reply-To: <20050913.151216.48124942.davem@davemloft.net>

On Tue, Sep 13, 2005 at 03:12:16PM -0700, David S. Miller wrote:
> From: Ravikiran G Thirumalai <kiran@scalex86.org>
> Date: Tue, 13 Sep 2005 15:07:37 -0700
> ...
> But using bigrefs, no way.  We have enough trouble making the data
> structures small without adding bloat like that.  A busy server can
> have hundreds of thousands of dst cache entries active on it, and they
> chew up enough memory as is.
> 

But even 1 Million dst cache entries would be 16+4 MB additional for a 4 cpu 
box....is that too much?  The alloc_percpu reimplementation interleaves
objects on cache lines, unlike the existing implementation which pads per-cpu
objects to cache lines...

If you are referring to embedded routing devices,
would they use CONFIG_NUMA or CONFIG_SMP?? (bigrefs nicely fold back to
regular atomic_t s on UPs)

Thanks,
Kiran

  reply	other threads:[~2005-09-13 23:17 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-09-13 15:51 [patch 0/11] mm: Reimplementation of dynamic per-cpu allocator Ravikiran G Thirumalai
2005-09-13 15:54 ` [patch 1/11] mm: Reimplementation of dynamic per-cpu allocator -- vmalloc_fixup Ravikiran G Thirumalai
2005-09-13 19:25   ` Andrew Morton
2005-09-13 15:56 ` [patch 2/11] mm: Reimplementation of dynamic per-cpu allocator -- alloc_percpu Ravikiran G Thirumalai
2005-09-13 15:58 ` [patch 3/11] mm: Reimplementation of dynamic per-cpu allocator -- alloc_percpu_atomic Ravikiran G Thirumalai
2005-09-13 15:59 ` [patch 4/11] mm: Reimplementation of dynamic per-cpu allocator -- change_alloc_percpu_users Ravikiran G Thirumalai
2005-09-13 16:01 ` [patch 5/11] mm: Bigrefs -- add_getcpuptr Ravikiran G Thirumalai
2005-09-13 16:04 ` [patch 6/11] mm: Bigrefs -- distributed refcounters Ravikiran G Thirumalai
2005-09-14  7:36   ` Rusty Russell
2005-09-14 20:03     ` Ravikiran G Thirumalai
2005-09-13 16:10 ` [patch 7/11] net: Use bigrefs for net_device.refcount Ravikiran G Thirumalai
2005-09-13 16:26   ` Stephen Hemminger
2005-09-13 16:35     ` Ben Greear
2005-09-13 16:46       ` Stephen Hemminger
2005-09-13 20:26     ` David S. Miller
2005-09-13 22:16       ` Ravikiran G Thirumalai
2005-09-13 18:27   ` Eric Dumazet
2005-09-13 18:53     ` Ravikiran G Thirumalai
2005-09-13 16:12 ` [patch 8/11] net: dst_abstraction macros Ravikiran G Thirumalai
2005-09-13 16:17 ` [patch 9/11] net: dst_entry.refcount, use, lastuse to use alloc_percpu Ravikiran G Thirumalai
2005-09-13 20:24   ` David S. Miller
2005-09-13 22:07     ` Ravikiran G Thirumalai
2005-09-13 22:12       ` David S. Miller
2005-09-13 23:17         ` Ravikiran G Thirumalai [this message]
2005-09-13 23:27           ` David S. Miller
2005-09-14  7:21             ` Rusty Russell
2005-09-13 16:18 ` [patch 10/11] mm: Reimplementation of dynamic per-cpu allocator -- allow_early_mapvmarea Ravikiran G Thirumalai
2005-09-13 16:19 ` [patch 11/11] mm: Reimplementation of dynamic per-cpu allocator -- hotplug_alloc_percpu_blocks Ravikiran G Thirumalai

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