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SubjectRe: [PATCH 3/3] Minor improvement for smsc95xx netusb driver performance.
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Hello.

On 11/25/2015 10:15 PM, Ameen wrote:

> Reduce number of memcpy's by 1-2 improve transmit performance by 2-4%.
> or reduce cpu usage on a comparable value.

CPU.

> Signed-off-by: Ameen Ali <AmeenAli023@gmail.com>
> ---
> drivers/net/usb/smsc95xx.c | 30 ++++++++++++++++--------------
> 1 file changed, 16 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
> index 66b3ab9..022d2f63 100644
> --- a/drivers/net/usb/smsc95xx.c
> +++ b/drivers/net/usb/smsc95xx.c
> @@ -1830,7 +1830,9 @@ static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
> {
> bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
> int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
> - u32 tx_cmd_a, tx_cmd_b;
> + struct tx_commands_t {
> + u32 cmd_a, cmd_b, csum_preamble;
> + }tx_cmds;

Need space after }.

>
> /* We do not advertise SG, so skbs should be already linearized */
> BUG_ON(skb_shinfo(skb)->nr_frags);
> @@ -1855,26 +1857,26 @@ static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
[...]
>
> - skb_push(skb, 4);
> - tx_cmd_b = (u32)(skb->len - 4);
> + tx_cmds.cmd_a = (u32)(skb->len) | TX_CMD_A_FIRST_SEG_ |

Parens around 'skb->len' not needed.

[...]

MBR, Sergei



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