From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <erdnetdev@gmail.com>
Subject: Re: Major network performance regression in 3.7
Date: Sun, 06 Jan 2013 10:51:16 -0800
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> 
> (sd->len is usually 4096, which is expected, but sd->total_len value is
> huge in your case, so we always set the flag in fs/splice.c)

I am testing :

       if (sd->len < sd->total_len && pipe->nrbufs > 1)
                more |= MSG_SENDPAGE_NOTLAST;