From: xander.huff@ni•com (Xander Huff)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] iio: adc: xilinx-xadc: Convert to raw spinlock
Date: Thu, 14 May 2015 17:45:04 -0500 [thread overview]
Message-ID: <55552570.5050407@ni.com> (raw)
In-Reply-To: <20150514171038.GG13442@linutronix.de>
On 5/14/2015 12:10 PM, Sebastian Andrzej Siewior wrote:
>
> Do you have any cyclictest numbers how much the latency increases on
> heavy iio usage? Traditionally the primary handler should be very quick
> / short.
>
> Sebastian
>
With no other processes running, I got the following results after a couple of
hours on one of our devices:
admin at Xander-roboRIO:~# cyclictest -S -m -p 98
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 0.01 0.07 0.12 1/176 1473
T: 0 ( 1373) P:98 I:1000 C:6503872 Min: 9 Act: 13 Avg: 13 Max: 51
T: 1 ( 1374) P:98 I:1500 C:4335914 Min: 9 Act: 12 Avg: 13 Max: 49
With a VI reading all default handles (raw, offset, scale, sampling_frequency)
in /sys/bus/iio/devices/iio:device0 constantly in a while loop, I got the
following results after a couple hours on the same device:
admin at Xander-roboRIO:~# cyclictest -S -m -p 98
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 6.93 7.30 7.47 3/182 1530
T: 0 ( 1487) P:98 I:1000 C:4497008 Min: 11 Act: 20 Avg: 21 Max: 69
T: 1 ( 1488) P:98 I:1500 C:2998005 Min: 11 Act: 20 Avg: 22 Max: 59
--
Xander Huff
Staff Software Engineer
National Instruments
next prev parent reply other threads:[~2015-05-14 22:45 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-07 15:38 [PATCH] iio: adc: xilinx-xadc: Convert to raw spinlock Xander Huff
2015-05-14 17:10 ` Sebastian Andrzej Siewior
2015-05-14 22:45 ` Xander Huff [this message]
2015-05-18 21:17 ` Sebastian Andrzej Siewior
2015-05-23 11:36 ` Jonathan Cameron
2015-06-07 15:29 ` Jonathan Cameron
2015-06-08 14:44 ` Xander Huff
2015-07-08 21:38 ` [PATCH v2] iio: adc: xilinx-xadc: Push interrupts into threaded context Xander Huff
2015-07-14 14:28 ` Sebastian Andrzej Siewior
2015-07-15 15:59 ` Xander Huff
[not found] ` <CAKfKVtGTO81wLWk50M303t2WjcBEMEt_LUnsJ3_WmvR_3izUjg@mail.gmail.com>
2015-07-15 15:57 ` Xander Huff
2015-07-20 23:14 ` [PATCH v3] " Xander Huff
2015-07-24 12:38 ` Lars-Peter Clausen
2015-08-03 20:18 ` Xander Huff
2015-08-04 8:01 ` Lars-Peter Clausen
2015-08-11 23:00 ` [PATCH v4] iio: adc: xilinx-xadc: Push interrupts into hardirq context Xander Huff
2015-08-12 15:17 ` Lars-Peter Clausen
2015-08-12 16:33 ` Sebastian Andrzej Siewior
2015-08-15 19:55 ` Jonathan Cameron
2015-08-04 5:34 ` [PATCH v3] iio: adc: xilinx-xadc: Push interrupts into threaded context Shubhrajyoti Datta
2015-08-04 8:05 ` Lars-Peter Clausen
2015-08-07 3:55 ` Shubhrajyoti Datta
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