Re: [PATCH] net: add per device sg_max_frags for skb

[David Miller]

From: Eric Dumazet <edumazet@xxxxxxxxxx>
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.