calibrate_migration_costs takes ages on s390

The boot sequence on s390 sometimes takes ages and we spend a very long time
(up to one or two minutes) in calibrate_migration_costs. The time spent there
differs from boot to boot. Also the calculated costs differ a lot. I've seen
differences by up to a factor of 15 (yes, factor not percent).
Also I doubt that making these measurements make much sense on a completely
virtualized architecture where you cannot tell how much cpu time you will
get anyway.
Is there any workaround or fix available so we can avoid seeing this?

Thanks,
Heiko
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• Follow-Ups:
  • Re: calibrate_migration_costs takes ages on s390
    • From: Ingo Molnar <[email protected]>
  • Re: calibrate_migration_costs takes ages on s390
    • From: "David S. Miller" <[email protected]>

• Prev by Date: 2.6.16-rc3, sata_nv PM resume, x86-64
• Next by Date: Re: [PATCH] remove duplicate #includes
• Previous by thread: 2.6.16-rc3, sata_nv PM resume, x86-64
• Next by thread: Re: calibrate_migration_costs takes ages on s390
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]