linux-kernel - [PATCH 4/9] USB: pl2303: increase the bulk-out buffer size to 256 byte

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1268863245-17230-5-git-send-email-jhovold@gmail.com>
Date:	Wed, 17 Mar 2010 23:00:40 +0100
From:	Johan Hovold <jhovold@...il.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Johan Hovold <jhovold@...il.com>
Subject: [PATCH 4/9] USB: pl2303: increase the bulk-out buffer size to 256 byte

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 <jhovold@...il.com>
---
 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/