netdev - Re: [PATCH net-next 03/11] sfc: Increase size of RX SKB header area

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1371681500.3252.341.camel@edumazet-glaptop>
Date:	Wed, 19 Jun 2013 15:38:20 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-net-drivers@...arflare.com
Subject: Re: [PATCH net-next 03/11] sfc: Increase size of RX SKB header area

On Wed, 2013-06-19 at 23:18 +0100, Ben Hutchings wrote:
> From: Jon Cooper <jcooper@...arflare.com>
> 
> This allows the SKB to hold the headers without reallocation more often.
> 
> Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
> ---
>  drivers/net/ethernet/sfc/rx.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c
> index b915e09..6efff3d 100644
> --- a/drivers/net/ethernet/sfc/rx.c
> +++ b/drivers/net/ethernet/sfc/rx.c
> @@ -36,7 +36,7 @@
>  #define EFX_RECYCLE_RING_SIZE_NOIOMMU (2 * EFX_RX_PREFERRED_BATCH)
>  
>  /* Size of buffer allocated for skb header area. */
> -#define EFX_SKB_HEADERS  64u
> +#define EFX_SKB_HEADERS  128u
>  

Yes, TCP with timestamps needs 66 bytes of headers on IPv4, and more on
IPv6...


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html