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From: Huang Shijie <huangsj@hygon.cn>
To: <peterz@infradead.org>, <mingo@redhat.com>, <acme@kernel.org>,
	<namhyung@kernel.org>
Cc: <zhongyuan@hygon.cn>, <fangbaoshun@hygon.cn>,
	<yingzhiwei@hygon.cn>, <mark.rutland@arm.com>,
	<alexander.shishkin@linux.intel.com>, <jolsa@kernel.org>,
	<irogers@google.com>, <adrian.hunter@intel.com>,
	<james.clark@linaro.org>, <tglx@kernel.org>, <bp@alien8.de>,
	<dave.hansen@linux.intel.com>, <x86@kernel.org>, <hpa@zytor.com>,
	<linux-perf-users@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <liuqi@hygon.cn>,
	<lijing@hygon.cn>, <wangfengyu@hygon.cn>, <wujiangyong@hygon.cn>,
	<shijie8@gmail.com>, <1537577747@qq.com>
Subject: Re: [PATCH] perf/amd/ibs: add phy_addr_only software filter for ibs_op
Date: Wed, 28 Oct 2026 15:52:23 +0800	[thread overview]
Message-ID: <auGpt6wenUj5mFP8@hsj-2U-Workstation> (raw)
In-Reply-To: <20260902085251.4046240-1-huangsj@hygon.cn>

Hi Ravi,

Thanks for taking a look.

> Why not simply use the BPF filter?
>   $ perf record -e ibs_op// --phys-data --filter 'phys_addr != 0' ...

I did try the BPF filter.

Measurements below are system-wide ibs_op sampling for 5s on a
384-CPU Hygon box under a 400-thread sysbench oltp_read_only load
at three sampling periods:

    -c     filter        valid samples    
  ------  ------------  ---------- 
  100000  phy_addr_only  19,345,907 
  100000  BPF filter     17,939,819 

   30000  phy_addr_only  54,670,617 
   30000  BPF filter     47,926,784 

   10000  phy_addr_only  61,606,488 
   10000  BPF filter     40,826,086 


The phy_addr_only produces more *valid* samples than the BPF filter.

Thanks,
Huang Shijie


      parent reply	other threads:[~2026-10-28  7:52 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-02  8:52 Huang Shijie
2026-10-27  9:14 ` Ravi Bangoria
2026-10-28  7:52 ` Huang Shijie [this message]

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