Messages in this thread | | | Date | Thu, 11 Jul 2002 10:28:41 +1000 | From | Lincoln Dale <> | Subject | Re: HZ, preferably as small as possible |
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At 02:28 PM 10/07/2002 -0700, Andrew Morton wrote: > > But on the other hand, increasing HZ has perf/latency benefits, yes? Have > > these been quantified? > >Not that I'm aware of. And I'd regard any such claims with some >scepticism.
for one, i'm using a modified version of the network FIFO queue discipline to inject "delay" and "drop", similar to what ippipe can do on FreeBSD. given i'm using a kernel timer for this, HZ >= 1000 is essential for <1.5 millisecond accuracy.
perhaps we really need a high-speed timer mechanism for parts of the kernel that require it (or a highly-accurate single-fire timer)?
cheers,
lincoln.
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