[lttng-dev] Limitations on subbuf_size / num_subbuf?

[Amit Margalit]

Hi,

Thank for the quick response. Here is the missing data:

UST
2.6.32.12-205 (I had to make a tiny patch to make it compile)
MemTotal:       24628852 kB
lttng-ust-2.1.2
lttng-tools-2.1.1
lttng-modules-2.1.1
babeltrace-1.1.0
userspace-rcu-0.7.6

Which patch for 4MB?

Thanks,

Amit Margalit
IBM XIV - Storage Reinvented
XIV-NAS Development Team
Tel. 03-689-7774
Fax. 03-689-7230



From:   Matthew Khouzam <matthew.khouzam at ericsson.com>
To:     <lttng-dev at lists.lttng.org>
Date:   04/15/2013 05:24 PM
Subject:        Re: [lttng-dev] Limitations on subbuf_size / num_subbuf?



Not at all a n00b question, but could you give some more info? what is 
your version of LTTng tools, are you using UST or kernel tracing? How much 
ram is on your system? Kernel version? 

I actually have the patched lttng that has standard subbuffer sizes of 4 
mb, so I have not personnaly seen that problem. But the first thing I 
would do is upgrade to the latest stable.

On 13-04-14 06:49 AM, Amit Margalit wrote:
Hello, 

Sorry for the noob question. I seem to be unable to define the total of 
subbuf_size * num_subbuf higher than 4MB. I am getting ~30% discarded 
tracepoint data. 

Any assistance would be greatly appreciated. 

Amit Margalit 
IBM XIV - Storage Reinvented 
XIV-NAS Development Team 
Tel. 03-689-7774 
Fax. 03-689-7230 

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