| To: | Eric Lemoine <eric.lemoine@xxxxxxxxx> |
|---|---|
| Subject: | Re: [openib-general] Re: LLTX and netif_stop_queue |
| From: | Grant Grundler <iod00d@xxxxxx> |
| Date: | Mon, 3 Jan 2005 09:12:27 -0800 |
| Cc: | Roland Dreier <roland@xxxxxxxxxxx>, netdev@xxxxxxxxxxx, hadi@xxxxxxxxxx, Andi Kleen <ak@xxxxxxx>, openib-general@xxxxxxxxxx, Patrick McHardy <kaber@xxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx> |
| In-reply-to: | <5cac192f0501030907c755135@mail.gmail.com> |
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On Mon, Jan 03, 2005 at 06:07:00PM +0100, Eric Lemoine wrote: > If I understand correctly, LLTX aims at avoiding cache misses on lock > variables (because of cacheline bouncing). So the effect of LLTX > should increase as the number of CPUs not sharing the same cache > increases. And two CPUs might not be enough... Cacheline bouncing usually starts to show up with > 4 CPUs (ie 8 or more). Some workloads that Jamal cares about (routing) only need 2 cpus. grant |
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