Messages in this thread |  | | | Date | Tue, 13 Sep 2005 16:17:17 -0700 | | From | Ravikiran G Thirumalai <> | | Subject | Re: [patch 9/11] net: dst_entry.refcount, use, lastuse to use alloc_percpu |
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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)
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