Re: No updating after changing the system time

On Fri, Apr 18, 2014 at 5:30 AM, slhhust <[email protected]> wrote:

> Hi all,
> We used snmpwalk to get some network interface statistics, e.g.
> ifInOctets. But, after we changed the system time from 4:00 pm to 3:00
> pm, the output seemed never updating for a long time.
> Having a glance at the source code, i set the IFTABLE_CACHE_TIMEOUT form
> 30 to 1, and changed the cache->enabled to 0,  yet it seemed neither of
> them made sense. Did i miss something?
> In addition, i think using *gettimeofday* to determine whether a timeout
> occurs is a bit problematic. Actually, the system time may be changed
> for some reasons, and the delta could be negative. If the system time
> was changed to long before, the cache would stay unflushed for long.
> We'd better to use a monotonic clock, like
> clock_gettime(CLOCK_MONOTONIC,...), right?
>

5.7.2 does.

  Bill

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