Re: lockup when C1E and high-resolution timers enabled

From: Christoph Fritz
Date: Sun Jun 14 2015 - 19:39:06 EST


On Sun, 2015-06-14 at 23:24 +0800, Daniel J Blueman wrote:
> val=0x$(setpci -s 00:18.3 0xd4.l) # read D18F3xD4
> val=$((val &~(1 << 13))) # clear bit13 (MTC1eEn)
> setpci -d 1022:1603 0xd4.l=$(printf %x $val) # write back

This slows down the whole system dramatically:

- before: MTC1eEn set: Booting takes 11 secs
- after : MTC1eEn cleared: Booting takes 53 secs

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/