From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755593Ab0CQWGw (ORCPT ); Wed, 17 Mar 2010 18:06:52 -0400 Received: from mail-ew0-f221.google.com ([209.85.219.221]:36574 "EHLO mail-ew0-f221.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755765Ab0CQWGs (ORCPT ); Wed, 17 Mar 2010 18:06:48 -0400 X-Greylist: delayed 305 seconds by postgrey-1.27 at vger.kernel.org; Wed, 17 Mar 2010 18:06:09 EDT 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=gaGfxavo/iwuYfUfHXvr9tM9C9NOQxG7eb7py4xiqa4MBbwPD1j2domQAD26OloGvK cXCjg5FQR78CPLDtpqo2xh9XZAfOAJ/SG77+Bv5V8dPTmvtBvRropn77T0ObNpMyiJ63 cFQ75TEFxT6NLoDiJzLqygpt+D8d+MXDy6gfs= From: Johan Hovold To: Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold Subject: [PATCH 4/9] USB: pl2303: increase the bulk-out buffer size to 256 byte Date: Wed, 17 Mar 2010 23:00:40 +0100 Message-Id: <1268863245-17230-5-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 as well as lowered CPU usage. The buffer is big enough to keep up also at 3Mbaud (128b would not suffice). 64b 256b 921k: 640 KB/s 870 KB/s 3M: 640 KB/s 2520 KB/s Signed-off-by: Johan Hovold --- drivers/usb/serial/pl2303.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c index 1891cfb..afa3744 100644 --- a/drivers/usb/serial/pl2303.c +++ b/drivers/usb/serial/pl2303.c @@ -1168,6 +1168,7 @@ static struct usb_serial_driver pl2303_device = { .id_table = id_table, .usb_driver = &pl2303_driver, .num_ports = 1, + .bulk_out_size = 256, .open = pl2303_open, .close = pl2303_close, .dtr_rts = pl2303_dtr_rts, -- 1.7.0.2