On Fri, Jan 27, 2006 at 09:53:53AM +0100, Eric Dumazet wrote:
> Ravikiran G Thirumalai a écrit :
> >Change the atomic_t sockets_allocated member of struct proto to a
> >per-cpu counter.
> >
> >Signed-off-by: Pravin B. Shelar <[email protected]>
> >Signed-off-by: Ravikiran Thirumalai <[email protected]>
> >Signed-off-by: Shai Fultheim <[email protected]>
> >
> Hi Ravikiran
>
> If I correctly read this patch, I think there is a scalability problem.
>
> On a big SMP machine, read_sockets_allocated() is going to be a real killer.
>
> Say we have 128 Opterons CPUS in a box.
read_sockets_allocated is being invoked when when /proc/net/protocols is read,
which can be assumed as not frequent.
At sk_stream_mem_schedule(), read_sockets_allocated() is invoked only
certain conditions, under memory pressure -- on a large CPU count machine,
you'd have large memory, and I don't think read_sockets_allocated would get
called often. It did not atleast on our 8cpu/16G box. So this should be OK
I think.
There're no 128 CPU Opteron boxes yet afaik ;).
Thanks,
Kiran
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