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Wed, 17 Jul 2024 17:42:43 +0000 Date: Wed, 17 Jul 2024 19:42:42 +0200 From: Petr Vorel To: Cyril Hrubis , Li Wang , Andrea Cervesato , Jan Stancek Message-ID: <20240717174242.GA687454@pevik> MIME-Version: 1.0 Content-Disposition: inline X-Spamd-Result: default: False [-3.71 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_RHS_NOT_FQDN(0.50)[]; HAS_REPLYTO(0.30)[pvorel@suse.cz]; R_DKIM_ALLOW(-0.20)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; TO_DN_SOME(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.cz:replyto,suse.cz:dkim]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; MISSING_XM_UA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_TLS_ALL(0.00)[]; DKIM_TRACE(0.00)[suse.cz:+]; REPLYTO_EQ_FROM(0.00)[] X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Rspamd-Action: no action X-Rspamd-Queue-Id: F1BC91FD05 X-Virus-Scanned: clamav-milter 1.0.3 at in-7.smtp.seeweb.it X-Virus-Status: Clean Subject: [LTP] Realtime testsuite X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Petr Vorel Cc: ltp@lists.linux.it Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Hi all, we have ticket about realtime testsuite evaluation [1]. I put there some old investigation made by Mel Gorman. At the time we wanted to migrate everything to rt-tests. Cyril considered sched_football useful enough also for regular non-RT systems, thus I ported it to new library in 43dc52fafa ("sched_football: Rewrite into new API"). And there is a followup patchset [3] [4] which among other things always enables realtime and put sched_football also to runtest/sched. But we should decide what to do with the rest. Would you have time to have look if something else is good enough to be kept in LTP? I suggest to contribute pi_perf and prio-wake to rt-tests and ask also linux-rt-users community to have look on the tests (specially realtime/stress/pi-tests and testcases/realtime/perf/latency which Mel did not reviewed) and act based on their investigation (port or remove). BTW Mel reported about sched_football: Interesting, might be worth reimplementing. The concept is interesting as a test but it has weaknesses. The sched_yield usage is one thing but also, it only works if the number of players equals the number of CPUs and small changes in sched_yield semantics would break the test. IMHO we should remove -n option, so that ncpu is always used. I also wonder, what breaks -i2. Kind regards, Petr [1] https://github.com/linux-test-project/ltp/issues/1078 [2] https://git.kernel.org/pub/scm/utils/rt-tests/rt-tests.git [3] https://patchwork.ozlabs.org/project/ltp/list/?series=415662&state=* [4] https://lore.kernel.org/ltp/20240717171713.687339-1-pvorel@suse.cz/ -- Mailing list info: https://lists.linux.it/listinfo/ltp