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USB: pl2303: increase the bulk-out buffer size to 256 byte

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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@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Johan Hovold 2010-03-17 23:00:40 +01:00 committed by Greg Kroah-Hartman
parent aea006b93a
commit 3efeaff629
1 changed files with 1 additions and 0 deletions
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1
drivers/usb/serial/pl2303.c
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@ -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,