dtracing ZFS on FreeBSD

Tom Curry thomasrcurry at gmail.com
Fri Feb 19 19:14:25 UTC 2016

On Fri, Feb 19, 2016 at 2:07 PM, Michael W. Lucas <mwlucas at michaelwlucas.com
> wrote:

> On Fri, Feb 19, 2016 at 01:51:21PM -0500, Tom Curry wrote:
> >    For the variable drops you could try increasing the buffer size, I
> know
> >    I ran into this when I was tracing something very noisy and it
> >    definitely helped.
> >    #pragma D option bufsize=1m
> Cranking it up to the limit of 16m helps, thank you.
> But the problem still appears during load, just not as often.
> Any other suggestions, anyone?
One other thing to try in concert with the larger buffer,

#pragma D option bufpolicy=ring

In theory I would expect it not to drop, but the window of tracing would be

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