From patchwork Sat Jul 28 16:46:22 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 10548023 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6870D14E0 for ; Sat, 28 Jul 2018 16:46:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 595F72B104 for ; Sat, 28 Jul 2018 16:46:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4DA3C2B107; Sat, 28 Jul 2018 16:46:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C45ED2B104 for ; Sat, 28 Jul 2018 16:46:47 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 018FB6E218; Sat, 28 Jul 2018 16:46:47 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from fireflyinternet.com (mail.fireflyinternet.com [109.228.58.192]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1386E6E218 for ; Sat, 28 Jul 2018 16:46:45 +0000 (UTC) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.65.138; Received: from haswell.alporthouse.com (unverified [78.156.65.138]) by fireflyinternet.com (Firefly Internet (M1)) with ESMTP id 12491855-1500050 for multiple; Sat, 28 Jul 2018 17:46:22 +0100 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Sat, 28 Jul 2018 17:46:22 +0100 Message-Id: <20180728164623.10613-4-chris@chris-wilson.co.uk> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180728164623.10613-1-chris@chris-wilson.co.uk> References: <20180728164623.10613-1-chris@chris-wilson.co.uk> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 4/5] drm/i915: Increase initial busyspin limit X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ben Widawsky , Eero Tamminen Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP Here we bump the busyspin for the current request to avoid sleeping and the cost of both idling and downclocking the CPU. Signed-off-by: Chris Wilson Cc: Sagar Kamble Cc: Eero Tamminen Cc: Francisco Jerez Cc: Tvrtko Ursulin Cc: Ben Widawsky Cc: Joonas Lahtinen Cc: Michał Winiarski --- drivers/gpu/drm/i915/Kconfig.profile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/Kconfig.profile b/drivers/gpu/drm/i915/Kconfig.profile index de394dea4a14..54e0ba4051e7 100644 --- a/drivers/gpu/drm/i915/Kconfig.profile +++ b/drivers/gpu/drm/i915/Kconfig.profile @@ -1,6 +1,6 @@ config DRM_I915_SPIN_REQUEST_IRQ int - default 5 # microseconds + default 250 # microseconds help Before sleeping waiting for a request (GPU operation) to complete, we may spend some time polling for its completion. As the IRQ may