From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756058Ab0CQWIv (ORCPT ); Wed, 17 Mar 2010 18:08:51 -0400 Received: from ey-out-2122.google.com ([74.125.78.24]:6552 "EHLO ey-out-2122.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753965Ab0CQWIu (ORCPT ); Wed, 17 Mar 2010 18:08:50 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=R/rlmIygSY56myDLrc8Zw3P43mD30ZGgZ9AnxGxP7pHh17GdNawcWthTrgDh+T2O67 BizZqg8+cnLe2bMxwx4bSc5hYl/9pnoylmL/pzk6TYXLWpNJV720Is6puJH3cnK1qhPe o0j+h+fv9/OUlR8sn6ZY3mcIxM4/3uo94M55s= From: Johan Hovold To: Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold Subject: [PATCH 2/9] USB: cp210x: increase the bulk-out buffer size to 256 byte Date: Wed, 17 Mar 2010 23:00:38 +0100 Message-Id: <1268863245-17230-3-git-send-email-jhovold@gmail.com> X-Mailer: git-send-email 1.7.0.2 In-Reply-To: <1268863245-17230-1-git-send-email-jhovold@gmail.com> References: <1268863245-17230-1-git-send-email-jhovold@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Increase the bulk-out buffer size from 64 to 256 byte. This gives a significant increase in throughput already at 1Mbaud (e.g. 710 instead of 640 KB/s) as well as lowered CPU usage. Signed-off-by: Johan Hovold --- drivers/usb/serial/cp210x.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c index ec9b044..e344000 100644 --- a/drivers/usb/serial/cp210x.c +++ b/drivers/usb/serial/cp210x.c @@ -138,6 +138,7 @@ static struct usb_serial_driver cp210x_device = { .usb_driver = &cp210x_driver, .id_table = id_table, .num_ports = 1, + .bulk_out_size = 256, .open = cp210x_open, .close = cp210x_close, .break_ctl = cp210x_break_ctl, -- 1.7.0.2