From: David Brownell <david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
To: Ned Forrester <nforrester-/d+BM93fTQY@public.gmane.org>
Cc: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
stephen-nl6u4wocdmy51APUEpUfAkEOCMrvLtNR@public.gmane.org
Subject: Re: PXA270 SSPSFRM gates chip select ?
Date: Mon, 11 Feb 2008 20:20:25 -0800 [thread overview]
Message-ID: <200802112020.25436.david-b@pacbell.net> (raw)
In-Reply-To: <47B11178.6090904-/d+BM93fTQY@public.gmane.org>
On Monday 11 February 2008, Ned Forrester wrote:
> I believe tasklets will never run later than the next timer
> tick, which I believe is 1ms on most moder processors (but which can be
> changed). Thus 1ms should be the maximum latency; I would expect better
> than 1ms most of the time.
Actually, on ARM the default HZ is 100, not 1000 ... so the default
latency would be 10 msec not 1 msec.
Recent kernels have oneshot clockevent support for PXA though, so
there are many options. I don't recall whether HZ is settable there,
but high-res timers might affect scheduling a bit.
- Dave
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next prev parent reply other threads:[~2008-02-12 4:20 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-11 22:43 PXA270 SSPSFRM gates chip select ? J. Scott Merritt
[not found] ` <20080211174339.73ca7ed5.merrij3-IL7dBOYR4Vg@public.gmane.org>
2008-02-11 22:54 ` Zik Saleeba
[not found] ` <33e9dd1c0802111454k5deeaa38o9d21cee610b79da7-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-02-12 2:51 ` David Brownell
[not found] ` <200802111851.10155.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2008-02-12 3:15 ` Zik Saleeba
[not found] ` <33e9dd1c0802111915q48cb80ecxb33461a9263f9295-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-02-12 4:02 ` David Brownell
2008-02-12 3:24 ` Ned Forrester
[not found] ` <47B11178.6090904-/d+BM93fTQY@public.gmane.org>
2008-02-12 3:48 ` Zik Saleeba
[not found] ` <33e9dd1c0802111948u2256d0adj8caa478073795d78-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-02-12 4:16 ` David Brownell
2008-02-12 4:19 ` Zik Saleeba
2008-02-12 4:43 ` Ned Forrester
[not found] ` <47B12406.9040208-/d+BM93fTQY@public.gmane.org>
2008-02-12 5:24 ` Zik Saleeba
[not found] ` <33e9dd1c0802112124y5ae8dd39ua9078f2b3878a018-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-02-12 20:48 ` Zik Saleeba
2008-02-12 4:20 ` David Brownell [this message]
2008-02-11 23:26 ` Ned Forrester
[not found] ` <47B0D9A4.6080104-/d+BM93fTQY@public.gmane.org>
2008-02-12 4:08 ` Ned Forrester
2008-11-07 16:43 ` PXA270 SSP DMA Corruption J. Scott Merritt
[not found] ` <20081107114312.2f34b389.merrij3-IL7dBOYR4Vg@public.gmane.org>
2008-11-07 18:59 ` Ned Forrester
2008-11-07 19:00 ` PXA270 SSP DMA Corruption - correction J. Scott Merritt
[not found] ` <20081107184819.54baa679.merrij3@rpi.edu>
[not found] ` <491B6249.7070407@whoi.edu>
[not found] ` <491B6249.7070407-/d+BM93fTQY@public.gmane.org>
2008-11-13 1:24 ` PXA270 SSP DMA Corruption J. Scott Merritt
[not found] ` <20081112202438.61c28cf4.merrij3-IL7dBOYR4Vg@public.gmane.org>
2008-11-13 1:48 ` Ned Forrester
[not found] ` <491B8783.9050800-/d+BM93fTQY@public.gmane.org>
2008-11-13 1:59 ` Ned Forrester
[not found] ` <20081112213403.402948b9.merrij3@rpi.edu>
[not found] ` <20081112213403.402948b9.merrij3-IL7dBOYR4Vg@public.gmane.org>
2008-11-13 3:19 ` Ned Forrester
[not found] ` <20081113120134.70d533c8.merrij3@rpi.edu>
[not found] ` <20081113120134.70d533c8.merrij3-IL7dBOYR4Vg@public.gmane.org>
2008-11-13 18:54 ` Ned Forrester
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