Re: [PATCH 1/5] Add a global synchronization point for pvclock

Jeremy Fitzhardinge
2010-04-19T16:19:40Z

On 04/19/2010 07:26 AM, Glauber Costa wrote:
>> Is the problem that the tscs are starting out of sync, or that they're
>> drifting relative to each other over time? Do the problems become worse
>> the longer the uptime? How large are the offsets we're talking about here?
>>
> The offsets usually seem pretty small, under a microsecond. So I don't think
> it has anything to do with tscs starting out of sync. Specially because the
> delta-based calculation has the exact purpose of handling that case.
>

So you think they're drifting out of sync from an initially synced
state? If so, what would bound the drift?

J