From: Johan Hovold Date: Wed, 17 Mar 2010 22:00:40 +0000 (+0100) Subject: USB: pl2303: increase the bulk-out buffer size to 256 byte X-Git-Tag: v5.15~29568^2~197 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=3efeaff6298290b36499532f0b4c87aa4bae8aef;p=mirror_ubuntu-kernels.git 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 --- diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c index b10b0efe3e06..03fe472fee32 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,