From: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
To: linux-kselftest@vger.kernel.org
Cc: LKML <linux-kernel@vger.kernel.org>,
Reinette Chatre <reinette.chatre@intel.com>,
Fenghua Yu <fenghua.yu@intel.com>, Shuah Khan <shuah@kernel.org>,
Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Subject: Re: [PATCH 22/22] selftests/resctrl: Rewrite Cache Allocation Technology (CAT) test
Date: Thu, 13 Apr 2023 13:12:30 +0300 (EEST) [thread overview]
Message-ID: <9912c0bd-f1c8-1f27-17a0-2a3d48279e75@linux.intel.com> (raw)
In-Reply-To: <20230412132122.29452-23-ilpo.jarvinen@linux.intel.com>
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On Wed, 12 Apr 2023, Ilpo Järvinen wrote:
> Rewrite the CAT test to allocated a buffer sized to half of LLC. Then
> perform a sequence of tests with different LLC block sizes starting
> from 1-bit CBM to half of the CBM bits. Flush the buffer before each
> test and read the buffer twice. Observe the LLC misses on the second
> read through the buffer. As the allocated LLC block gets larger and
> larger, the LLC misses will become smaller and smaller giving a strong
> signal on CAT working properly.
I realized this description is now wrong way around as I at one point
reversed the cache allocation mask to go from half of CBM bits to 1-bit
but didn't remember to update the changelog (in case somebody ends up
wondering why it doesn't match to what the code does). V2 will contain the
correct way around description.
--
i.
prev parent reply other threads:[~2023-04-13 10:13 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-12 13:21 [PATCH 00/22] selftests/resctrl: Fixes, cleanups, and rewritten CAT test Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 01/22] selftests/resctrl: Add resctrl.h into build deps Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 02/22] selftests/resctrl: Check also too low values for CBM bits Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 03/22] selftests/resctrl: Make span unsigned long everywhere Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 04/22] selftests/resctrl: Express span in bytes Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 05/22] selftests/resctrl: Remove duplicated preparation for span arg Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 06/22] selftests/resctrl: Don't use variable argument list for ->setup() Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 07/22] selftests/resctrl: Remove "malloc_and_init_memory" param from run_fill_buf() Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 08/22] selftests/resctrl: Split run_fill_buf() to alloc, work, and dealloc helpers Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 09/22] selftests/resctrl: Remove start_buf local variable from buffer alloc func Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 10/22] selftests/resctrl: Don't pass test name to fill_buf Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 11/22] selftests/resctrl: Add flush_buffer() " Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 12/22] selftests/resctrl: Remove test type checks from cat_val() Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 13/22] selftests/resctrl: Refactor get_cbm_mask() Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 14/22] selftests/resctrl: Create cache_alloc_size() helper Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 15/22] selftests/resctrl: Replace count_bits with count_consecutive_bits() Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 16/22] selftests/resctrl: Exclude shareable bits from schemata in CAT test Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 17/22] selftests/resctrl: Pass the real number of tests to show_cache_info() Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 18/22] selftests/resctrl: Move CAT/CMT test global vars to func they are used Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 19/22] selftests/resctrl: Read in less obvious order to defeat prefetch optimizations Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 20/22] selftests/resctrl: Split measure_cache_vals() function Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 21/22] selftests/resctrl: Split show_cache_info() to test specific and generic parts Ilpo Järvinen
2023-04-12 13:21 ` [PATCH 22/22] selftests/resctrl: Rewrite Cache Allocation Technology (CAT) test Ilpo Järvinen
2023-04-13 10:12 ` Ilpo Järvinen [this message]
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