Messages in this thread | | | Date | Tue, 07 Oct 2008 09:16:13 -0500 | From | Christoph Lameter <> | Subject | Re: [PATCH 3/3] Convert the UDP hash lock to RCU |
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Evgeniy Polyakov wrote: > On Mon, Oct 06, 2008 at 06:08:09PM -0500, Corey Minyard (minyard@acm.org) wrote: >> Would using SLAB_DESTROY_BY_RCU be ok, or would that be too expensive? > > I tested skb destruction via RCU path, and got 2.5 times worse numbers > with small-packets-bulk-transfer workload.
Was this with regular RCU freeing? This will cool down the cacheline before frees. You need SLAB_DESTROY_BY_RCU to keep the objects cache hot.
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