diff options
author | Helge Deller <deller@gmx.de> | 2023-08-25 18:46:39 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-09-19 13:27:57 +0300 |
commit | db5d5673ab7ec45e0463d23e41465a31d0288846 (patch) | |
tree | 2a2838e32f4380d5a2355a175032088104e93de6 /drivers | |
parent | ff2c44f0118d0ab4b563a6fd52359cbe78a3c9cd (diff) | |
download | linux-db5d5673ab7ec45e0463d23e41465a31d0288846.tar.xz |
parisc: led: Reduce CPU overhead for disk & lan LED computation
commit 358ad816e52d4253b38c2f312e6b1cbd89e0dbf7 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>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/parisc/led.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/parisc/led.c b/drivers/parisc/led.c index 8bdc5e043831..3737c1021f88 100644 --- a/drivers/parisc/led.c +++ b/drivers/parisc/led.c @@ -56,8 +56,8 @@ static int led_type __read_mostly = -1; static unsigned char lastleds; /* LED state from most recent update */ static unsigned int led_heartbeat __read_mostly = 1; -static unsigned int led_diskio __read_mostly = 1; -static unsigned int led_lanrxtx __read_mostly = 1; +static unsigned int led_diskio __read_mostly; +static unsigned int led_lanrxtx __read_mostly; static char lcd_text[32] __read_mostly; static char lcd_text_default[32] __read_mostly; static int lcd_no_led_support __read_mostly = 0; /* KittyHawk doesn't support LED on its LCD */ |