From 3efeaff6298290b36499532f0b4c87aa4bae8aef Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Wed, 17 Mar 2010 23:00:40 +0100 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/pl2303.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c index b10b0ef..03fe472 100644 --- a/drivers/usb/serial/pl2303.c +++ b/drivers/usb/serial/pl2303.c @@ -1170,6 +1170,7 @@ 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, -- 2.7.4