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
next prev parent reply other threads:[~2005-09-13 23:17 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20050913155112.GB3570@localhost.localdomain>
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
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