Phil Dibowitz wrote:
On Wed, May 24, 2006 at 02:23:05PM -0400, Jeff Garzik wrote:
I disagree that we should bother about clearing statistics. It always
adds more complication than necessary. Few (if any) other statistics in
Linux permit easy clearing, often because adding operations other than
'increment' or 'read' requires adding expensive spinlocks or atomic
operations.
Every networking device in the world supports clearing interface statistics.
Why should linux not be able to do the most basic operation on any
cisco/juniper/enterasys/whatever managed switch or router?
It's a common operation on a network interface, I don't see why this is a
concern.
When I'm debugging a networking issue On a cluster of hundreds and hundreds
of machines at work, I want to be able to reset them all quickly, and get a
rough idea of if they're all climbing, if they're all climbing at the same
rate, etc. And being able to do "for i in `cat hostlist`; do ssh $i ethtool -z
eth0; done" is really, really, REALLY, useful.
Obtaining the difference between two numbers is not that difficult.
Given any method of clearing statistics across your cluster, I'm certain
you can come up with a similar method of obtaining the current statistic
(the baseline).
Jeff
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