netdev - RE: [PATCH v2 0/2] net/sctp: Avoid allocating high order memory with kmalloc()

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Message-ID: <cd32848f0018432fad7246620d32c4e5@AcuMS.aculab.com>
Date:   Fri, 3 Aug 2018 16:43:28 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Konstantin Khorenko' <khorenko@...tuozzo.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
CC:     "oleg.babin@...il.com" <oleg.babin@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        "Vlad Yasevich" <vyasevich@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        "Xin Long" <lucien.xin@...il.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>
Subject: RE: [PATCH v2 0/2] net/sctp: Avoid allocating high order memory with
 kmalloc()

From: Konstantin Khorenko
> Sent: 03 August 2018 17:21
> 
> Each SCTP association can have up to 65535 input and output streams.
> For each stream type an array of sctp_stream_in or sctp_stream_out
> structures is allocated using kmalloc_array() function. This function
> allocates physically contiguous memory regions, so this can lead
> to allocation of memory regions of very high order, i.e.:
...

Given how useless SCTP streams are, does anything actually use
more than about 4?

	David

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