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parisc: led: Reduce CPU overhead for disk & lan LED computation
commit 358ad816e5
upstream.
Older PA-RISC machines have LEDs which show the disk- and LAN-activity.
The computation is done in software and takes quite some time, e.g. on a
J6500 this may take up to 60% time of one CPU if the machine is loaded
via network traffic.
Since most people don't care about the LEDs, start with LEDs disabled and
just show a CPU heartbeat LED. The disk and LAN LEDs can be turned on
manually via /proc/pdc/led.
Signed-off-by: Helge Deller <deller@gmx.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
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0fe7b6d676
1 changed files with 2 additions and 2 deletions
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@ -56,8 +56,8 @@
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static int led_type __read_mostly = -1;
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static unsigned char lastleds; /* LED state from most recent update */
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static unsigned int led_heartbeat __read_mostly = 1;
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static unsigned int led_diskio __read_mostly = 1;
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static unsigned int led_lanrxtx __read_mostly = 1;
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static unsigned int led_diskio __read_mostly;
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static unsigned int led_lanrxtx __read_mostly;
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static char lcd_text[32] __read_mostly;
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static char lcd_text_default[32] __read_mostly;
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static int lcd_no_led_support __read_mostly = 0; /* KittyHawk doesn't support LED on its LCD */
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