netdev - Re: [PATCH v2 net-next] net: sched: use no more than one page in struct fw

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: <20140318091942.GE8956@casper.infradead.org>
Date:	Tue, 18 Mar 2014 09:19:42 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, john.fastabend@...il.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next] net: sched: use no more than one page in
 struct fw_head

On 03/17/14 at 08:20pm, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> In commit b4e9b520ca5d ("[NET_SCHED]: Add mask support to fwmark
> classifier") Patrick added an u32 field in fw_head, making it slightly
> bigger than one page.
> 
> Lets use 256 slots to make fw_hash() more straight forward, and move
> @mask to the beginning of the structure as we often use a small number
> of skb->mark. @mask and first hash buckets share the same cache line.
> 
> This brings back the memory usage to less than 4000 bytes, and permits
> John to add a rcu_head at the end of the structure later without any
> worry.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Thomas Graf <tgraf@...g.ch>
> Cc: John Fastabend <john.fastabend@...il.com>

Acked-by: Thomas Graf <tgraf@...g.ch>
--
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