From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Fri, 12 Sep 2025 09:44:54 +0200 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1uwySk-0029eT-1U for lore@lore.pengutronix.de; Fri, 12 Sep 2025 09:44:54 +0200 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1uwySj-0003cb-UP for lore@pengutronix.de; Fri, 12 Sep 2025 09:44:54 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:Date:Message-Id:Subject:References:In-Reply-To:To: From:Reply-To:Cc:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=14WDImyiUuV5NrgdkRViQu21dJbUwQxeRwmBOKpFPBQ=; b=cGi+EGywrhf+jQ7UcWuQ6FDYnM 0kSbnv2fQObYOlRUt4mk/aDL2FdFR6/HK0vOBG23Qt8E9Hszw8NlmEv1TfwM0gk2DE+jQf6NDklaw oBHxMqYeYD59y6fCAieNYzah+b9cGi50HjsWHSYUV+8r49lOgQNSFdi5Z3HskCXsRPyoSkyIQ+OkA DCUBEdifs66zYRUTv2Do1SB4ECxVlh9KDHfX//OzfTBxmQBGo++kPNnaUeA/25SjV8khq04WuwMk2 bjQsJegkCgWnNKtegplYymJ+JGkXp8Zm5vVUeOwhNW3DBxp9o8Y2TYNzo83LejV+ubCxEXk8mUd2k 7pWPkGAA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uwySC-00000007iTo-1dMB; Fri, 12 Sep 2025 07:44:20 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uwyS9-00000007iTI-1PwQ for barebox@lists.infradead.org; Fri, 12 Sep 2025 07:44:19 +0000 Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1uwyS6-0003Ww-CY; Fri, 12 Sep 2025 09:44:14 +0200 Received: from dude02.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::28]) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1uwyS6-000teT-0c; Fri, 12 Sep 2025 09:44:14 +0200 Received: from localhost ([::1] helo=dude02.red.stw.pengutronix.de) by dude02.red.stw.pengutronix.de with esmtp (Exim 4.98.2) (envelope-from ) id 1uwyS6-00000007N5d-0X2N; Fri, 12 Sep 2025 09:44:14 +0200 From: Sascha Hauer To: barebox@lists.infradead.org, Steffen Trumtrar In-Reply-To: <20250910-v2025-08-0-topic-mvebu-spi-v1-1-c3e57dbb7503@pengutronix.de> References: <20250910-v2025-08-0-topic-mvebu-spi-v1-1-c3e57dbb7503@pengutronix.de> Message-Id: <175766305411.1757044.14258182261681475716.b4-ty@pengutronix.de> Date: Fri, 12 Sep 2025 09:44:14 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Mailer: b4 0.14.2 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250912_004417_380725_BCCCBBBC X-CRM114-Status: UNSURE ( 6.32 ) X-CRM114-Notice: Please train this message. X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-4.5 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_LOW,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: Re: [PATCH] spi: mvebu: move timekeeping out of hot path X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) On Wed, 10 Sep 2025 07:42:25 +0200, Steffen Trumtrar wrote: > The wait_on_timeout uses get_time_ns for timekeeping. It seems that this > considerably decreases transfer speeds, because the wait_on_timeout loop > gets throttled by the timekeeping. > Moving the timekeeping after the hot path results in ~3x transfer speed. > Keep the wait_on_timeout after the hot path to be sure, that the code > nevertheless waits long enough once. > > [...] Applied, thanks! [1/1] spi: mvebu: move timekeeping out of hot path https://git.pengutronix.de/cgit/barebox/commit/?id=4ac86ef4ef1e (link may not be stable) Best regards, -- Sascha Hauer