netdev - Re: [PATCH] net: core: alloc_netdev_mqs reduce alignment overhead

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Message-ID: <20240625082900.1928b932@kernel.org>
Date: Tue, 25 Jun 2024 08:29:00 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Chris Gregory <czipperz@...il.com>
Cc: netdev@...r.kernel.org
Subject: Re: [PATCH] net: core: alloc_netdev_mqs reduce alignment overhead

On Mon, 24 Jun 2024 03:58:04 -0400 Chris Gregory wrote:
> I was reading over alloc_netdev_mqs and noticed that it's trying to
> align the allocation by adding on 31 bytes (NETDEV_ALIGN-1).  I'm not
> an expert on kmalloc, but AFAICT it will always give back a pointer
> aligned to ARCH_KMALLOC_MINALIGN.  On my x86_64,
> ARCH_KMALLOC_MINALIGN=8 so this saves 7 bytes which could mean an
> 8-byte allocation is freed up.

We're reworking the priv handling to use a flexible array:
https://lore.kernel.org/all/20240229225910.79e224cf@kernel.org/
one more series of prep needs to get merged, and we'll convert.
-- 
pw-bot: reject