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    Subject[PATCH 4/9] USB: pl2303: increase the bulk-out buffer size to 256 byte
    Date
    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>
    ---
    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


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