Messages in this thread | | | Date | Sat, 25 Mar 2000 18:01:53 -0500 (EST) | From | "Albert D. Cahalan" <> | Subject | Re: Some interrupt latency figures for 2.3.99-pre3 |
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Andrew Morton writes:
> 400MHz uniprocessor Celeron. I am using non-DMA IDE, networking and > very little else. > > The workload involved compiling a kernel, starting X, some NFS client > activity and a fair bit of paging. All times in microseconds. > > file-n-line Count Min Max Avg > > console.c:2015 -> console.c:2039 224 .88 2068.86 21.90 > console.c:1857 -> console.c:1975 3283 .74 1943.17 15.80 > cs89x0.c:1186 -> cs89x0.c:1207 504 43.82 1280.56 143.47 > vt.c:810 -> vt.c:812 1 982.32 982.32 982.32 > ide-disk.c:451 -> ll_rw_blk.c:277 157 126.23 959.35 334.22 > ide-disk.c:451 -> ide.c:1622 1718 118.94 956.99 277.61 > ide.c:1533 -> ide.c:1622 8911 14.52 952.61 606.20 > ide.c:1533 -> ide.c:1298 3904 10.79 884.30 202.74 ... > I would be interested in hearing views on how significant a 2 msec > interrupt blockage really is. Can it cause serial Rx overruns? GigE > problems?
Viewing the worst case as 483 HZ makes it look awful. You could lose 3 clock ticks with a 1024 HZ clock.
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