[lttng-dev] [RFC PATCH lttng-tools] Bump default kernel, and UST per-uid/per-pid buffer size

[Jérémie Galarneau]

Merged, thanks!

Jérémie

On 31 March 2017 at 10:04, Mathieu Desnoyers
<mathieu.desnoyers at efficios.com> wrote:
> LTTng with current default buffer size often lead to discarded events,
> which is not something we want as a first user impression.
>
> The choice of default buffer size were made conservatively around 2010.
> Since then, the memory available on typical systems has increased, and
> so has the amount of instrumentation available. As an example, the
> mid-2010 Macbook Pro had 2GB ram. The current 2017 Macbook specification
> states 8GB ram, for a 4-fold installed memory size increase.
>
> Increase the kernel tracer buffer size from:
> 4 x 256kB per core
> to:
> 4 x 1MB per core
>
> Increase the UST tracer per-uid buffer size from:
> 4 x 128kB per core
> to
> 4 x 512kB per core
>
> Increase the UST tracer per-pid buffer size from:
> 4 x 4kB per core
> to
> 4 x 16kB per core
>
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
> ---
>  configure.ac | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/configure.ac b/configure.ac
> index 0a7034e..91a2d5e 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -240,7 +240,7 @@ AC_DEFUN([_AC_DEFINE_QUOTED_AND_SUBST], [
>  ])
>
>  # Default values
> -m4_define([_DEFAULT_CHANNEL_SUBBUF_SIZE], [4096])
> +m4_define([_DEFAULT_CHANNEL_SUBBUF_SIZE], [16384])
>  m4_define([_DEFAULT_CHANNEL_SUBBUF_NUM], [4])
>  m4_define([_DEFAULT_CHANNEL_SWITCH_TIMER], [0])
>  m4_define([_DEFAULT_CHANNEL_LIVE_TIMER], [0])
> @@ -253,7 +253,7 @@ _AC_DEFINE_AND_SUBST([DEFAULT_CHANNEL_TRACEFILE_SIZE], [0])
>  _AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_LIVE_TIMER], [_DEFAULT_CHANNEL_LIVE_TIMER])
>  _AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_READ_TIMER], [_DEFAULT_CHANNEL_READ_TIMER])
>  _AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM], [_DEFAULT_CHANNEL_SUBBUF_NUM])
> -_AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE], [262144])
> +_AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE], [1048576])
>  _AC_DEFINE_AND_SUBST([DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER], [_DEFAULT_CHANNEL_SWITCH_TIMER])
>  _AC_DEFINE_AND_SUBST([DEFAULT_LTTNG_LIVE_TIMER], [1000000])
>  _AC_DEFINE_AND_SUBST([DEFAULT_METADATA_CACHE_SIZE], [4096])
> @@ -272,7 +272,7 @@ _AC_DEFINE_AND_SUBST([DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER], [_DEFAULT_CHANNEL_S
>  _AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_LIVE_TIMER], [_DEFAULT_CHANNEL_LIVE_TIMER])
>  _AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_READ_TIMER], [0])
>  _AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM], [_DEFAULT_CHANNEL_SUBBUF_NUM])
> -_AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_SUBBUF_SIZE], [131072])
> +_AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_SUBBUF_SIZE], [524288])
>  _AC_DEFINE_AND_SUBST([DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER], [_DEFAULT_CHANNEL_SWITCH_TIMER])
>  _AC_DEFINE_QUOTED_AND_SUBST([DEFAULT_AGENT_BIND_ADDRESS], [localhost])
>  _AC_DEFINE_QUOTED_AND_SUBST([DEFAULT_NETWORK_CONTROL_BIND_ADDRESS], [0.0.0.0])
> --
> 2.1.4
>



-- 
Jérémie Galarneau
EfficiOS Inc.
http://www.efficios.com