netdev - Re: [PATCH net-next v2] unix: add read side socket memory accounting for dgram sockets

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: <20140225.171723.153997808883782867.davem@davemloft.net>
Date:	Tue, 25 Feb 2014 17:17:23 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	hannes@...essinduktion.org
Cc:	netdev@...r.kernel.org, yannick@...hler.name,
	eric.dumazet@...il.com, xiyou.wangcong@...il.com, dan@...dstab.net
Subject: Re: [PATCH net-next v2] unix: add read side socket memory
 accounting for dgram sockets

From: Hannes Frederic Sowa <hannes@...essinduktion.org>
Date: Wed, 19 Feb 2014 21:08:11 +0100

> On Wed, Feb 19, 2014 at 02:49:27PM -0500, David Miller wrote:
>> From: Hannes Frederic Sowa <hannes@...essinduktion.org>
>> Date: Mon, 17 Feb 2014 14:03:53 +0100
>> 
>> > We still allocate dgram packets with sock_alloc_send_pskb, which now
>> > does normally not block if the socket has too many packets in flight.
>> 
>> It seems like it does to me, it does sock_wait_for_wmem(), right?
> 
> We still do the sock_wait_for_wmem in sock_alloc_send_pskb, correct,
> but we rarly block there, maybe in highly concurrent cases with big
> payloads where one process got interrupted to account the memory to the
> receiving socket.
> 
>> Or are you trying to say that usually this is not the point at which
>> we block, but rather it's when we check the peer's receive queue?
> 
> Exactly.

Just FYI, I'm not ignoring this patch, I'm just thinking about it a lot.
--
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