linux-kernel - Re: [PATCH v2 00/59] x86/retbleed: Call depth tracking mitigation

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Message-ID: <20220916093548.p2n7fpz7orwp24lz@techsingularity.net>
Date:   Fri, 16 Sep 2022 10:35:48 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        x86@...nel.org, Linus Torvalds <torvalds@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Andrew Cooper <Andrew.Cooper3@...rix.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Johannes Wikner <kwikner@...z.ch>,
        Alyssa Milburn <alyssa.milburn@...ux.intel.com>,
        Jann Horn <jannh@...gle.com>, "H.J. Lu" <hjl.tools@...il.com>,
        Joao Moreira <joao.moreira@...el.com>,
        Joseph Nuzman <joseph.nuzman@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Juergen Gross <jgross@...e.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH v2 00/59] x86/retbleed: Call depth tracking mitigation

On Fri, Sep 02, 2022 at 03:06:25PM +0200, Peter Zijlstra wrote:
> Excerpts from IBRS vs stuff from Mel's testing:
> 

FWIW, I retested this version as there were slight changes and retbleed=stuff
on Skylake is still far faster than the default. The default performance
differences are mostly within the noise versus a vanilla 6.0-rc3 kernel.
Other generations of Intel machine showed mostly noise. Zen[1-3] showed
no significant difference (immune to retbleed but functional alignment or
percpu structure changes might have mattered). For the series;

Tested-by: Mel Gorman <mgorman@...hsingularity.net>

-- 
Mel Gorman
SUSE Labs