From: Xin Long <lucien.xin@gmail.com>
To: Aaron Lu <aaron.lu@intel.com>
Cc: kernel test robot <xiaolong.ye@intel.com>,
Stephen Rothwell <sfr@canb.auug.org.au>,
lkp@01.org, "David S. Miller" <davem@davemloft.net>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [LKP] [lkp] [sctp] a6c2f79287: netperf.Throughput_Mbps -37.2% regression
Date: Wed, 17 Aug 2016 13:41:04 +0800 [thread overview]
Message-ID: <CADvbK_f1exO4YaPCjmBQ0MorrXB2vPMZsSSbPh=AB2-XrU3xpg@mail.gmail.com> (raw)
In-Reply-To: <371c1f25-bc00-c36a-a7f5-fbe05cd58abc@intel.com>
> The perf-profile data for the two commits are attached(for the case of
> prsctp_enable=1, the perf-profile data doesn't get collected for the 0
> case for some reason, I'm checking the problem now).
>
> The CPU gets much more idle time in the bisected commit a6c2f79287:
>
> 68.89% 0.70% [kernel.kallsyms] [k] entry_SYSCALL_64_fastpath
> 49.32% 0.12% [kernel.kallsyms] [k] sys_sendmsg
> 49.17% 0.12% [kernel.kallsyms] [k] __sys_sendmsg
> 48.58% 0.22% [kernel.kallsyms] [k] ___sys_sendmsg
> 46.69% 0.06% [kernel.kallsyms] [k] sock_sendmsg
> 46.31% 0.16% [kernel.kallsyms] [k] inet_sendmsg
> 45.90% 0.98% [kernel.kallsyms] [k] sctp_sendmsg
> 29.66% 0.45% [kernel.kallsyms] [k] sctp_do_sm
> 29.54% 0.23% [kernel.kallsyms] [k] cpu_startup_entry
> 28.81% 0.68% [kernel.kallsyms] [k] sctp_cmd_interpreter.isra.24
> 26.20% 0.00% [kernel.kallsyms] [k] start_secondary
> 23.04% 0.09% [kernel.kallsyms] [k] sctp_inq_push
> 23.03% 0.08% [kernel.kallsyms] [k] call_cpuidle
> 22.94% 0.00% [kernel.kallsyms] [k] cpuidle_enter
> 22.60% 0.18% [kernel.kallsyms] [k] cpuidle_enter_state
> 21.99% 21.99% [kernel.kallsyms] [k] intel_idle
> ... ...
>
> While its immediate parent commit 826d253d57 is mostly busy working:
>
> 98.53% 0.83% [kernel.kallsyms] [k] entry_SYSCALL_64_fastpath
> 78.13% 0.12% [kernel.kallsyms] [k] sys_sendmsg
> 78.03% 0.16% [kernel.kallsyms] [k] __sys_sendmsg
> 77.08% 0.28% [kernel.kallsyms] [k] ___sys_sendmsg
> 74.44% 0.08% [kernel.kallsyms] [k] sock_sendmsg
> 73.82% 0.13% [kernel.kallsyms] [k] inet_sendmsg
> 73.34% 1.44% [kernel.kallsyms] [k] sctp_sendmsg
> 47.52% 0.75% [kernel.kallsyms] [k] sctp_do_sm
> 46.19% 0.90% [kernel.kallsyms] [k] sctp_cmd_interpreter.isra.24
> 37.17% 1.43% [kernel.kallsyms] [k] sctp_outq_flush
> 36.93% 0.08% [kernel.kallsyms] [k] sctp_outq_uncork
> 34.24% 0.15% [kernel.kallsyms] [k] sctp_inq_push
> ... ...
> No idle related function above 1%.
>
> Will the bisected commit make the idle possible?
No, not at all. :)
pls help to debug as I said in the last reply.
next prev parent reply other threads:[~2016-08-17 5:41 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-27 1:54 [lkp] [sctp] a6c2f79287: netperf.Throughput_Mbps -37.2% regression kernel test robot
2016-07-28 7:01 ` Xin Long
2016-08-05 3:31 ` [LKP] " Aaron Lu
2016-08-05 11:53 ` Xin Long
2016-08-08 2:10 ` Aaron Lu
2016-08-16 2:38 ` Aaron Lu
2016-08-16 8:02 ` Xin Long
2016-08-16 8:30 ` Aaron Lu
2016-08-16 8:51 ` Aaron Lu
2016-08-16 9:56 ` Xin Long
2016-08-17 5:04 ` Aaron Lu
2016-08-17 5:34 ` Xin Long
2016-08-17 5:34 ` Aaron Lu
2016-08-17 5:41 ` Xin Long [this message]
2016-08-17 6:14 ` Aaron Lu
2016-08-17 6:37 ` Aaron Lu
2016-08-17 6:42 ` Aaron Lu
2016-08-17 7:35 ` Xin Long
2016-08-17 7:42 ` Aaron Lu
2016-08-17 7:53 ` Aaron Lu
2016-08-17 8:02 ` Xin Long
2016-08-17 8:48 ` Aaron Lu
2016-08-17 8:58 ` Xin Long
2016-08-17 9:20 ` Aaron Lu
2016-08-17 18:06 ` Xin Long
2016-08-18 3:21 ` Aaron Lu
2016-08-18 12:45 ` Xin Long
2016-08-19 5:29 ` Aaron Lu
2016-08-19 7:19 ` Marcelo Ricardo Leitner
2016-08-19 7:24 ` Aaron Lu
2016-08-22 21:44 ` Marcelo Ricardo Leitner
2016-08-23 9:19 ` Aaron Lu
2016-09-30 7:05 ` Aaron Lu
2016-10-03 2:32 ` Xin Long
2016-10-09 7:41 ` Aaron Lu
2016-08-16 18:34 ` Xin Long
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