From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from picard.linux.it (picard.linux.it [213.254.12.146]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B1D39CA0FED for ; Fri, 5 Sep 2025 12:47:00 +0000 (UTC) Received: from picard.linux.it (localhost [IPv6:::1]) by picard.linux.it (Postfix) with ESMTP id 083CA3CD4F0 for ; Fri, 5 Sep 2025 14:46:59 +0200 (CEST) Received: from in-6.smtp.seeweb.it (in-6.smtp.seeweb.it [217.194.8.6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1)) (No client certificate requested) by picard.linux.it (Postfix) with ESMTPS id 739F63CB87F for ; Fri, 5 Sep 2025 14:46:43 +0200 (CEST) Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.223.130]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by in-6.smtp.seeweb.it (Postfix) with ESMTPS id CF30E1400BD7 for ; Fri, 5 Sep 2025 14:46:42 +0200 (CEST) Received: from imap1.dmz-prg2.suse.org (imap1.dmz-prg2.suse.org [IPv6:2a07:de40:b281:104:10:150:64:97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id 8DB524E647; Fri, 5 Sep 2025 12:46:41 +0000 (UTC) Authentication-Results: smtp-out1.suse.de; none Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 5C496139B9; Fri, 5 Sep 2025 12:46:41 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id O2h0FbHbumhXaAAAD6G6ig (envelope-from ); Fri, 05 Sep 2025 12:46:41 +0000 Date: Fri, 5 Sep 2025 14:46:32 +0200 From: Petr Vorel To: Cyril Hrubis Message-ID: <20250905124632.GA12403@pevik> References: <20250904102609.133359-1-liwang@redhat.com> <20250904110018.GA56668@pevik> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spamd-Result: default: False [-4.00 / 50.00]; REPLY(-4.00)[] X-Rspamd-Queue-Id: 8DB524E647 X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Rspamd-Action: no action X-Virus-Scanned: clamav-milter 1.0.7 at in-6.smtp.seeweb.it X-Virus-Status: Clean Subject: Re: [LTP] [PATCH v2] sched_football: synchronize with kickoff flag to reduce skew 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! > > This has improved something, but still observes sporadic fail on RHEL stock > > kernel. > > However, both the RHEL RT-kernel and the mainline v6.17-rc4 stock kernel > > pass. FYI I run tests all SLES and Tumbleweed versions on non-RT kernels, with -i50, for both master and your v2 (with enabled non-RT kernels). All are passing. * 6.16.3-1 (Tumbleweed, very close to kernel stable - it has very few patches unlike the others) CONFIG_PREEMPT_VOLUNTARY=y $ cat /sys/kernel/debug/sched/preempt none (voluntary) full lazy SLES (these are heavily modified) * 6.4 * 5.14 CONFIG_PREEMPT_VOLUNTARY=y $ cat /sys/kernel/debug/sched/preempt (none) voluntary full * 5.3 * 4.12 * 4.4 CONFIG_PREEMPT_NONE=y (/sys/kernel/debug/sched/preempt not enabled) Later I recheck what was your config which breaks it. > Maybe add a short usleep() before the referee sets the kickoff_flag so > that the system has more time to shuffle processes? +1 Kind regards, Petr -- Mailing list info: https://lists.linux.it/listinfo/ltp