Messages in this thread | | | Subject | Re: [RFC PATCH 0/9] Introduce housekeeping subsystem | From | Chris Metcalf <> | Date | Fri, 11 Aug 2017 11:08:09 -0400 |
| |
On 8/11/2017 2:36 AM, Mike Galbraith wrote: > On Thu, 2017-08-10 at 09:57 -0400, Chris Metcalf wrote: >> On 8/10/2017 8:54 AM, Frederic Weisbecker wrote: >>> But perhaps I should add a new NO_HZ_FULL_BUT_HOUSEKEEPING option. >>> Otherwise we'll change the meaning of NO_HZ_FULL_ALL way too much, to the point >>> that its default behaviour will be the exact opposite of the current one: by default >>> every CPU is housekeeping, so NO_HZ_FULL_ALL would have no effect anymore if we >>> don't set housekeeping boot option. >> Maybe a CONFIG_HOUSEKEEPING_BOOT_ONLY as a way to restrict housekeeping >> by default to just the boot cpu. In conjunction with NOHZ_FULL_ALL you would >> then get the expected semantics. > A big box with only the boot cpu for housekeeping is likely screwed.
Fair point - this kind of configuration would be primarily useful for dedicated systems that were running a high-traffic-rate networking application on many cores, for example. In this mode you don't end up putting a lot of burden on the housekeeping core. In any case, probably not worth adding an additional kernel config for.
-- Chris Metcalf, Mellanox Technologies http://www.mellanox.com
| |