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From: David Miller <davem@davemloft.net>
To: edumazet@google.com
Cc: hans.westgaard.ry@oracle.com, hannes@stressinduktion.org,
	David.Laight@aculab.com, kuznet@ms2.inr.ac.ru, jmorris@namei.org,
	yoshfuji@linux-ipv6.org, kaber@trash.net, ast@plumgrid.com,
	jiri@mellanox.com, daniel@iogearbox.net,
	nicolas.dichtel@6wind.com, ebiederm@xmission.com,
	noureddine@arista.com, jarod@redhat.com,
	makita.toshiaki@lab.ntt.co.jp, ja@ssi.bg, ying.xue@windriver.com,
	kraig@google.com, mgorman@techsingularity.net, edjee@google.com,
	julia.lawall@lip6.fr, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org, haakon.bugge@oracle.com,
	knut.omang@oracle.com, wei.lin.guay@oracle.com,
	santosh.shilimkar@oracle.com, yuval.shaia@oracle.com
Subject: Re: [PATCH] net: add per device sg_max_frags for skb
Date: Wed, 13 Jan 2016 10:38:25 -0500 (EST)	[thread overview]
Message-ID: <20160113.103825.475570791449704545.davem@davemloft.net> (raw)
In-Reply-To: <CANn89iJtB1qJCbBWUTXFo2LRWobQe6aDFb_KEWUhBNiZCNpdWA@mail.gmail.com>

From: Eric Dumazet <edumazet@google.com>
Date: Wed, 13 Jan 2016 06:19:11 -0800

> 2) TCP stack has coalescing support. write(2) or sendmsg(2) should
> append data into the last skb in write queue, and still use 32 KB
> frags.

Another way to get pathological SKBs is to do lots of tiny sendpage()
calls over discontiguous areas of the file.

  parent reply	other threads:[~2016-01-13 15:38 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-06 13:16 [PATCH] net: add per device sg_max_frags for skb Hans Westgaard Ry
2016-01-06 13:16 ` Hans Westgaard Ry
2016-01-06 13:59 ` David Laight
2016-01-06 13:59   ` David Laight
2016-01-08  9:55   ` Hans Westgaard Ry
2016-01-08  9:55     ` Hans Westgaard Ry
2016-01-08 10:33     ` David Laight
2016-01-08 10:33       ` David Laight
2016-01-08 11:47     ` Hannes Frederic Sowa
2016-01-08 11:47       ` Hannes Frederic Sowa
2016-01-13 13:57       ` Hans Westgaard Ry
2016-01-13 13:57         ` Hans Westgaard Ry
2016-01-13 14:19         ` Eric Dumazet
2016-01-13 14:19           ` Eric Dumazet
2016-01-13 14:20           ` Eric Dumazet
2016-01-13 14:20             ` Eric Dumazet
2016-01-13 15:07           ` Hannes Frederic Sowa
2016-01-13 15:07             ` Hannes Frederic Sowa
2016-01-13 15:38           ` David Miller [this message]
2016-01-13 15:44             ` Eric Dumazet
2016-01-13 15:44               ` Eric Dumazet
2016-01-13 21:07         ` Eric W. Biederman
2016-01-13 21:07           ` Eric W. Biederman
2016-01-27 13:20     ` [PATCH v2] net:Add sysctl_tcp_sg_max_skb_frags Hans Westgaard Ry
2016-01-27 15:15       ` Eric Dumazet
2016-01-27 18:12         ` Hannes Frederic Sowa
2016-02-01 13:12           ` Hans Westgaard Ry
2016-01-27 20:13       ` David Miller
2016-02-03  8:26     ` [PATCH v3] net:Add sysctl_max_skb_frags Hans Westgaard Ry
2016-02-03  8:26       ` Hans Westgaard Ry
2016-02-03 11:25       ` Herbert Xu
2016-02-03 11:36         ` Hannes Frederic Sowa
2016-02-03 12:20           ` Herbert Xu
2016-02-03 14:03             ` Hannes Frederic Sowa
2016-02-03 14:30             ` Eric Dumazet
2016-02-03 14:30               ` Eric Dumazet
2016-02-03 17:36             ` David Laight
2016-02-03 15:58       ` Alexander Duyck
2016-02-03 16:07         ` Eric Dumazet
2016-02-03 16:07           ` Eric Dumazet
2016-02-03 17:43           ` Alexander Duyck
2016-02-03 17:43             ` Alexander Duyck
2016-02-03 17:54             ` Eric Dumazet
2016-02-03 17:54               ` Eric Dumazet
2016-02-03 18:24               ` Alexander Duyck
2016-02-03 18:24                 ` Alexander Duyck
2016-02-03 19:23                 ` Eric Dumazet
2016-02-03 19:23                   ` Eric Dumazet
2016-02-03 21:03                   ` Alexander Duyck
2016-02-09  9:30       ` David Miller
2016-01-06 14:05 ` [PATCH] net: add per device sg_max_frags for skb Eric Dumazet
2016-01-06 14:05   ` Eric Dumazet
2016-01-08 10:01   ` Hans Westgaard Ry
2016-01-08 10:01     ` Hans Westgaard Ry

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