[lttng-dev] UST lttng enable-event output improvement

[David Goulet]

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Hey,

We have right now an opened bug about this exact issue. We will soon fix this
and, as you said, help considerably the user experience with subbuffer size :)

Thanks for the report!

Cheers
David

On 09/05/12 08:51 PM, Ettore Del Negro wrote:
> Hello, i have a simple question which may lead to a small user experience
> improvement:
> 
>> lttng create tsession
> Session tsession created. Traces will be written in
> .../lttng-traces/tsession-20120510-015819
>> lttng enable-channel tchan -u -s tsession --subbuf-size=1024
> UST channel tchan enabled for session tsession
> 
> a message stating that buffer size is set to a value different than default
> would be nice
> 
>> lttng enable-channel tchan -u -s tsession --subbuf-size=1022
> UST channel tchan enabled for session tsession
> 
> What happens? Is it set to a value not power of 2? Is it set to the default
> value? (i guess the latter). The help says: --subbuf-size SIZE   Subbuffer
> size in bytes (default: 4096, kernel default: 262144) Needs to be a power
> of 2 for kernel and ust tracers
> 
> Thanks, Ettore
> 
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> lttng-dev at lists.lttng.org 
> http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
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