lkml.org 
[lkml]   [2010]   [Mar]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH next-next-2.6 v2] virtio_net: missing sg_init_table
On Mon, Mar 29, 2010 at 06:19:15PM -0700, Shirley Ma wrote:
> Add missing sg_init_table for sg_set_buf in virtio_net which
> induced in defer skb patch.
>
> Reported-by: Thomas Müller <thomas@mathtm.de>
> Tested-by: Thomas Müller <thomas@mathtm.de>
> Signed-off-by: Shirley Ma <xma@us.ibm.com>

I'm concerned that the 'big' path might cause a performance regression.
Let's move sg into virtnet_info so that this needs to be only called
once?

> ---
> drivers/net/virtio_net.c | 2 ++
> 1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 25dc77c..3f5be35 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -326,6 +326,7 @@ static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp)
> struct scatterlist sg[2];
> int err;
>
> + sg_init_table(sg, 2);
> skb = netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN);
> if (unlikely(!skb))
> return -ENOMEM;
> @@ -351,6 +352,7 @@ static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp)
> char *p;
> int i, err, offset;
>
> + sg_init_table(sg, MAX_SKB_FRAGS + 2);
> /* page in sg[MAX_SKB_FRAGS + 1] is list tail */
> for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
> first = get_a_page(vi, gfp);
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe netdev" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2010-03-31 11:27    [W:0.058 / U:0.064 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site