David,

Thanks a lot for your prompt response. Do you have a specific solution in mind or will the calls be replaced with simple checks ?


Also while I have your attention can I ask your opinion about breaking up some TCP functions, mostly control functions into smaller units so that if a little different behavior is desired it can be achieved and common code could still be shared. Of course you can not say much without looking at the code but will you even entertain such a change ?

Regards,

Rao.


On 03/06/2018 08:43 PM, David Miller wrote:
From: Rao Shoaib <rao.sho...@oracle.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.

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