[lkml]   [2005]   [Aug]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] i386 No-Idle-Hz aka Dynamic-Ticks 5
On Mon, Aug 08, 2005 at 12:38:23AM -0700, Tony Lindgren wrote:
> It should not matter when the PIT gets reprogrammed, as the system time is
> not updated from PIT timer. Jiffies are calculated from a second timer, such
> as ACPI PM timer or TSC.

I am more worried about timer latencies and its effects. Because of this skew
between when jiffy interrupt was originally supposed to happen and when it
will now happen, it can lead to, for example, scheduling latencies upto
1 jiffy (for HZ=100, that could hurt some apps?) Not to mention that
this will not play well with high-res-timers, but that is probably
not a concern now!


Thanks and Regards,
Srivatsa Vaddagiri,
Linux Technology Center,
IBM Software Labs,
Bangalore, INDIA - 560017
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-08-08 17:09    [W:0.101 / U:6.968 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site