From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 461DD3176E3 for ; Mon, 27 Oct 2025 17:32:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761586353; cv=none; b=JxEoBbJEMimZlj/gl5O+i3vYltlh9TSM14hovFrOljQ7s35NBIgJ1kQVSd9JSvIwXKMzz/H5wIOy4R2pJBQ7FYbphgmwv0Zqi3lqJxmTOSZtCI0uZ9hYVBVFhmBHgx9BLLyroPAqFPbHSL3aKI9q+OJTqO0NXxGh+g7E/RjKx8k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761586353; c=relaxed/simple; bh=ThDDN49hubCs6tOgnnx2SFA3yS9UT22iylhuRKfhU6E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=JpVfii9aRzHcAq1bAzBk/Gc2LLqcUskou8UCokghMRN9BQDvBHaQQK2+g9H8K2z0oNbf7pNNc60jewbXnUBVuJSorCeYE0n4S5+RJfwnh3ERI4Ap66dGFb5ILO/+lbbGrOUQ18c1sYH2cH22aoVctLgHeXW+mvINFTYHI+54h58= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Rx5mjrJz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Rx5mjrJz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 290D5C113D0; Mon, 27 Oct 2025 17:32:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761586351; bh=ThDDN49hubCs6tOgnnx2SFA3yS9UT22iylhuRKfhU6E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Rx5mjrJzRK1KI00ti4mfBWP5dLvd9F4LxsVNq/S5Xl8XxYEvaZ1uNs2g6z5f1DprC pzun2chvt15ZSPFE8JiFfVIkDdqJgfOaC7UlbtTaBFUNj8lOxo5f5AHdoZmE2CzGS/ DPn5xhC2S+5Kvve7OONqyubKLhUxlErvAbPwIaq0U5AsycVb4So+usZ9Hbcx7ZHmtF vUL81k0tCCNx8TGGiHnTqwBZhxg8RIC15Kp7kGQZixg6Ucn8fWpd4k8GdGjAQwmzPP caNJzbWS0m120Lo9WZ4dKU4xvFvwTO0fV6zOxOtxPIXq9AvX6o+qm1jhX6MQOncn+e UTTj3HejVbb4w== From: Sasha Levin To: stable@vger.kernel.org Cc: Mathias Nyman , =?UTF-8?q?=C5=81ukasz=20Bartosik?= , Greg Kroah-Hartman , Sasha Levin Subject: [PATCH 6.1.y 4/6] xhci: dbc: Improve performance by removing delay in transfer event polling. Date: Mon, 27 Oct 2025 13:32:24 -0400 Message-ID: <20251027173226.609057-4-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251027173226.609057-1-sashal@kernel.org> References: <2025102713-cucumber-persevere-aa50@gregkh> <20251027173226.609057-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Mathias Nyman [ Upstream commit 03e3d9c2bd85cda941b3cf78e895c1498ac05c5f ] Queue event polling work with 0 delay in case there are pending transfers queued up. This is part 2 of a 3 part series that roughly triples dbc performace when using adb push and pull over dbc. Max/min push rate after patches is 210/118 MB/s, pull rate 171/133 MB/s, tested with large files (300MB-9GB) by Łukasz Bartosik First performance improvement patch was commit 31128e7492dc ("xhci: dbc: add dbgtty request to end of list once it completes") Cc: Łukasz Bartosik Signed-off-by: Mathias Nyman Link: https://lore.kernel.org/r/20241227120142.1035206-2-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman Stable-dep-of: f3d12ec847b9 ("xhci: dbc: fix bogus 1024 byte prefix if ttyDBC read races with stall event") Signed-off-by: Sasha Levin --- drivers/usb/host/xhci-dbgcap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/host/xhci-dbgcap.c b/drivers/usb/host/xhci-dbgcap.c index 643afd3ab0988..177382632614e 100644 --- a/drivers/usb/host/xhci-dbgcap.c +++ b/drivers/usb/host/xhci-dbgcap.c @@ -987,7 +987,7 @@ static void xhci_dbc_handle_events(struct work_struct *work) /* set fast poll rate if there are pending data transfers */ if (!list_empty(&dbc->eps[BULK_OUT].list_pending) || !list_empty(&dbc->eps[BULK_IN].list_pending)) - poll_interval = 1; + poll_interval = 0; break; default: dev_info(dbc->dev, "stop handling dbc events\n"); -- 2.51.0