* Why is the DENABLE_LTTNG compiler option in rdma-core disabled by default?
@ 2024-11-14 6:57 Junxian Huang
2024-11-14 11:41 ` Leon Romanovsky
0 siblings, 1 reply; 2+ messages in thread
From: Junxian Huang @ 2024-11-14 6:57 UTC (permalink / raw)
To: linux-rdma, Jason Gunthorpe, Leon Romanovsky, ynachum
Cc: Linuxarm, huangjunxian (C), Chengchang Tang, wenglianfa
Hi all!
We've been working on LTTng tracing for hns userspace provider
recently, and we wonder why the DENABLE_LTTNG compiler option
in rdma-core is disabled by default.
If it's due to the concern about performance degradation, we have
tested it on hns and found no significant performance difference
when the tracepoints are disabled.
Or is it because it introduces additional compilation dependency
on LTTng library?
Thanks,
Junxian
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Why is the DENABLE_LTTNG compiler option in rdma-core disabled by default?
2024-11-14 6:57 Why is the DENABLE_LTTNG compiler option in rdma-core disabled by default? Junxian Huang
@ 2024-11-14 11:41 ` Leon Romanovsky
0 siblings, 0 replies; 2+ messages in thread
From: Leon Romanovsky @ 2024-11-14 11:41 UTC (permalink / raw)
To: Junxian Huang
Cc: linux-rdma, Jason Gunthorpe, ynachum, Linuxarm, Chengchang Tang,
wenglianfa
On Thu, Nov 14, 2024 at 02:57:21PM +0800, Junxian Huang wrote:
> Hi all!
>
> We've been working on LTTng tracing for hns userspace provider
> recently, and we wonder why the DENABLE_LTTNG compiler option
> in rdma-core is disabled by default.
>
> If it's due to the concern about performance degradation, we have
> tested it on hns and found no significant performance difference
> when the tracepoints are disabled.
>
> Or is it because it introduces additional compilation dependency
> on LTTng library?
Yes, this is the reason. Most rdma-core users who use release version
will never need trace library in their life. They don't need an extra
dependency.
Thanks
>
> Thanks,
> Junxian
^ permalink raw reply [flat|nested] 2+ messages in thread
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