On 18/08/2023 18.26, Jakub Kicinski wrote:
On Tue, 15 Aug 2023 17:17:36 +0200 Jesper Dangaard Brouer wrote:
Subject: [PATCH net] net: use SLAB_NO_MERGE for kmem_cache skbuff_head_cache
Has this been a problem "forever"?
We're getting late in the release cycle for non-regression & non-crash
changes, even if small regression potential..
This patch is not dangerous ;-)
SKB slab/kmem_cache is already almost always "no_merge" (due to the
flags it uses), but certain kernel .config combinations can cause it to
be merged (with other 256 bytes slabs). I happen to hit this config
combination in my testlab, and noticed the problem slight performance
impact. If anything this patch makes it more consistent.
--Jesper
