Messages in this thread | | | From | Eric Dumazet <> | Date | Fri, 6 Jan 2017 08:48:49 -0800 | Subject | Re: __GFP_REPEAT usage in fq_alloc_node |
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On Fri, Jan 6, 2017 at 8:31 AM, Vlastimil Babka <vbabka@suse.cz> wrote:
> > I wonder what's that cause of the penalty (when accessing the vmapped > area I suppose?) Is it higher risk of collisions cache misses within the > area, compared to consecutive physical adresses?
I believe tests were done with 48 fq qdisc, each having 2^16 slots. So I had 48 blocs,of 524288 bytes.
Trying a bit harder at setup time to get 128 consecutive pages got less TLB pressure.
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