netdev - Re: [net-next] stmmac: limit max_mtu in case of 4KiB and use __netdev_alloc

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: <1318940770.2657.61.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
Date:	Tue, 18 Oct 2011 14:26:10 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [net-next] stmmac: limit max_mtu in case of 4KiB and use
 __netdev_alloc_skb (V2)

Le mardi 18 octobre 2011 à 13:39 +0200, Giuseppe CAVALLARO a écrit :
> Problem using big mtu around 4096 bytes is you end allocating (4096
> +NET_SKB_PAD + NET_IP_ALIGN + sizeof(struct skb_shared_info) bytes ->
> 8192 bytes : order-1 pages
> 
> It's better to limit the mtu to SKB_MAX_HEAD(NET_SKB_PAD),
> to have no more than one page per skb.
> 
> Also the patch changes the netdev_alloc_skb_ip_align() done in
> init_dma_desc_rings() and uses a variant allowing GFP_KERNEL allocations
> allowing the driver to load even in case of memory pressure.
> 
> Reported-by: Eric Dumazet <eric.dumazet@...il.com>
> Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
> 

Seems good, thanks :)

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>


--
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