linux-kernel - Re: Parallel compilation performance regression

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Message-ID: <20200619010513.GW8681@bombadil.infradead.org>
Date:   Thu, 18 Jun 2020 18:05:13 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     "Derrick, Jonathan" <jonathan.derrick@...el.com>
Cc:     "dhowells@...hat.com" <dhowells@...hat.com>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Parallel compilation performance regression

On Thu, Jun 18, 2020 at 11:52:55PM +0000, Derrick, Jonathan wrote:
> Hi David,
> 
> I've been experiencing a performance regression when running a parallel
> compilation (eg, make -j72) on recent kernels.

I bet you're using a version of make which predates 4.3:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0ddad21d3e99c743a3aa473121dc5561679e26bb