Re: Extreme system overhead on large IP27

[Atsushi Nemoto <anemo@mba.ocn.ne.jp>]

On Thu, 26 Oct 2006 00:42:16 -0700 (PDT), Manish Lachwani 
<m_lachwani@yahoo.com> wrote:
> It could be that I am seeing a similar issue on the
> SWARM board (sb1250) as well. Your patch removed the
> shifts for mip_hpt_frequency from
> arch/mips/sibyte/sb1250/time.c and in the
> sb1250_hpt_read(). The Sibyte HPT is 1 Mhz. However,
> when I added those shifts back, I did not see any
> issues with the system clock. I could possibly try out
> your patch with lower clocksource shift values and see
> if the system clock is still wrong.

I just sent the patch.  Please try it.

> Btw, the clocksource changes seem to work well on the
> BCM 1480 based board. 

Thanks, good news!

As Ralf pointed out, current code still problematic on some SMP
system, but I think IP27, SB1250, BCM1480 should be OK now while their
mips_hpt_read are not using per-CPU cp0 timers.

---
Atsushi Nemoto