From patchwork Tue Sep 3 14:47:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tomas Henzl X-Patchwork-Id: 13788833 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CBACB1422A2 for ; Tue, 3 Sep 2024 14:47:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725374861; cv=none; b=jLC18b2QEEyQVuzNe67UFR5DwKZvj9Lfc6vT/SQ+NoFxmaq1w/cpaQvayaXn3AU7NK/lzKfMsXWPfro0OtefYeZywQzOxf0TtKfWAEYD42jWvLSPVN/mu+gfQFnlWFLxChLaIbifzgnA/5ZLIa1H9Ng+V1nWxls3vU82EuNwtgA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725374861; c=relaxed/simple; bh=VDab0Vm9JaaWX1fKXKcqdKsXBM6M718Rsprq0NSK+GQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=tcJPlvBtkarx47yyRSr5W1yXqXnf48A1GPGUVGovytfPieDfOeSVWjihXX6E5toe+LLTSsCNH/Xez3hOG1q1vZkJzQCmrdeXnnbu408Xt8z8B/Mw55dCOdxSbW+sdsCK6bRGcbFnPs2BThmlWwCb2ZBPHMCWhTj9MPeCOWnGLXQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=EZRLn7A9; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="EZRLn7A9" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1725374858; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=akAmdofOK29d84VlYXM2XqitwBAbU+CCdVPrNLMeleo=; b=EZRLn7A9LbupIh7vZ+jlyLZebTgLsCk+pjAwOGOh2udF4hjm1XasgH33cbM2sRoP0ZDfHB fuhxT+kCiuu5i+u9vDwuVqVXmKRCFOVEKHBUnXkxpHsMg2MQoRlPFDriOlsmVe2tNQtuU9 jF591mCQnJVhgKYSlt6+Elxd/OZkOLg= Received: from mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-98-dCgouLRzMmKFSQTIoH_TZw-1; Tue, 03 Sep 2024 10:47:33 -0400 X-MC-Unique: dCgouLRzMmKFSQTIoH_TZw-1 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (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 mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 548D818EA81A; Tue, 3 Sep 2024 14:47:32 +0000 (UTC) Received: from localhost.redhat.com (unknown [10.45.225.54]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 68F631956048; Tue, 3 Sep 2024 14:47:30 +0000 (UTC) From: Tomas Henzl To: linux-scsi@vger.kernel.org Cc: chandrakanth.patil@broadcom.com, sathya.prakash@broadcom.com, jjurca@redhat.com, sumit.saxena@broadcom.com, ranjan.kumar@broadcom.com Subject: [PATCH v2] mpi3mr: a performance fix Date: Tue, 3 Sep 2024 16:47:29 +0200 Message-ID: <20240903144729.37218-1-thenzl@redhat.com> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Commit 0c52310f2600 ("hrtimer: Ignore slack time for RT tasks in schedule_hrtimeout_range()") effectivelly shortens a sleep in a polling function in the driver. That is causing a performance regression as the new value of just 2us is too low, in certain tests the perf drop is ~30%. Fix this by adjusting the sleep to 20us (close to the previous value). The '+1' added to the max parameter in usleep_range is there just to silence static code analyzers like checkpatch. Reported-by: Jan Jurca Signed-off-by: Tomas Henzl --- V2: added a '+ 1' to silence checkpatch. --- drivers/scsi/mpi3mr/mpi3mr.h | 2 +- drivers/scsi/mpi3mr/mpi3mr_fw.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/mpi3mr/mpi3mr.h b/drivers/scsi/mpi3mr/mpi3mr.h index dc2cdd5f0311..249c1a7285d6 100644 --- a/drivers/scsi/mpi3mr/mpi3mr.h +++ b/drivers/scsi/mpi3mr/mpi3mr.h @@ -178,7 +178,7 @@ extern atomic64_t event_counter; #define MPI3MR_DEFAULT_SDEV_QD 32 /* Definitions for Threaded IRQ poll*/ -#define MPI3MR_IRQ_POLL_SLEEP 2 +#define MPI3MR_IRQ_POLL_SLEEP 20 #define MPI3MR_IRQ_POLL_TRIGGER_IOCOUNT 8 /* Definitions for the controller security status*/ diff --git a/drivers/scsi/mpi3mr/mpi3mr_fw.c b/drivers/scsi/mpi3mr/mpi3mr_fw.c index c196dc14ad20..5695c95fca15 100644 --- a/drivers/scsi/mpi3mr/mpi3mr_fw.c +++ b/drivers/scsi/mpi3mr/mpi3mr_fw.c @@ -710,7 +710,7 @@ static irqreturn_t mpi3mr_isr_poll(int irq, void *privdata) mpi3mr_process_op_reply_q(mrioc, intr_info->op_reply_q); - usleep_range(MPI3MR_IRQ_POLL_SLEEP, 10 * MPI3MR_IRQ_POLL_SLEEP); + usleep_range(MPI3MR_IRQ_POLL_SLEEP, MPI3MR_IRQ_POLL_SLEEP + 1); } while (atomic_read(&intr_info->op_reply_q->pend_ios) && (num_op_reply < mrioc->max_host_ios));