netdev - Re: [PATCH] tcp: restore correct limit

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Date:	Tue, 10 Apr 2012 12:14:15 +0200
From:	Michal Simek <monstr@...str.eu>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	netdev@...r.kernel.org,
	John Williams <john.williams@...alogix.com>,
	David Miller <davem@...emloft.net>,
	Jason Wang <jasowang@...hat.com>,
	Glauber Costa <glommer@...allels.com>
Subject: Re: [PATCH] tcp: restore correct limit

On 04/10/2012 12:03 PM, Eric Dumazet wrote:
> Commit c43b874d5d714f (tcp: properly initialize tcp memory limits)
> added a regression on machines with low amount of memory, since sockets
> cant use 1/128 of memory but 1/1024
>
> Fix this to match comment and previous behavior.
>
> Signed-off-by: Eric Dumazet<eric.dumazet@...il.com>
> Cc: Jason Wang<jasowang@...hat.com>
> Cc: Glauber Costa<glommer@...allels.com>
> ---
>   net/ipv4/tcp.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
> index 5d54ed3..67d726e 100644
> --- a/net/ipv4/tcp.c
> +++ b/net/ipv4/tcp.c
> @@ -3302,7 +3302,7 @@ void __init tcp_init(void)
>
>   	tcp_init_mem(&init_net);
>   	/* Set per-socket limits to no more than 1/128 the pressure threshold */
> -	limit = nr_free_buffer_pages()<<  (PAGE_SHIFT - 10);
> +	limit = nr_free_buffer_pages()<<  (PAGE_SHIFT - 7);
>   	limit = max(limit, 128UL);
>   	max_share = min(4UL*1024*1024, limit);
>

hw design with csum is also much better.
Tested-by: Michal Simek <monstr@...str.eu>

Thanks for help,
Michal





-- 
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian
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