netdev - Re: Use of Indirect function calls

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Message-Id: <20180306.234340.1356364932905326057.davem@davemloft.net>
Date:   Tue, 06 Mar 2018 23:43:40 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     rao.shoaib@...cle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: Use of Indirect function calls

From: Rao Shoaib <rao.shoaib@...cle.com>
Date: Tue, 6 Mar 2018 19:35:46 -0800

> I do not expect any measurable overhead as modern CPU's use
> pre-fetching and multiple parallel execution engines.

Please see Spectre and retpolines, all of this parallel execution and
prefetching is essentially disabled to address those vulnerabilities
and side-channel exploits.

Indirect calls are terrible and we are now looking at ways in which
we can remove them from as many parts of the networking as possible.