On Wed, Oct 30, 2019 at 11:30:48AM +0800, txfh2007 wrote:
> I have been testing OVS-DPDK Rate limit using meter table these days, but
> I have found the rate deviation is larger than kernel meter. My test result
> is as below:
You didn't mention an OVS version number or commit number. It might be
important to make sure that the following commit is part of whatever
you're testing.
commit 42697ca7757b594cc841d944e43ffc17905e3188
Author: William Tu <u9012...@gmail.com>
Date: Fri Apr 19 15:26:41 2019 -0700
dpif-netdev: fix meter at high packet rate.
When testing packet rate around 1Mpps with meter enabled, the frequency
of hitting meter action becomes much higher, around 30us each time.
As a result, the meter's calculation of 'uint32_t delta_t' becomes
always 0 and meter action has no effect. This is due to the previous
commit 05f9e707e194 divides the delta by 1000, in order to convert to
msec granularity. The patch fixes it updating the time when across
millisecond boundary.
Fixes: 05f9e707e194 ("dpif-netdev: Use microsecond granularity.")
Acked-by: Yi-Hung Wei <yihung....@gmail.com>
Acked-by: Ilya Maximets <i.maxim...@samsung.com>
Signed-off-by: William Tu <u9012...@gmail.com>
Signed-off-by: Ben Pfaff <b...@ovn.org>
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