From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Thomas Haller <thaller@redhat.com>
Cc: NetFilter <netfilter-devel@vger.kernel.org>
Subject: Re: [PATCH nft 8/9] datatype: use __attribute__((packed)) instead of enum bitfields
Date: Wed, 20 Sep 2023 20:07:54 +0200 [thread overview]
Message-ID: <ZQs0+hZOmDPz64/s@calendula> (raw)
In-Reply-To: <d8bbc221d973199e2f4cd8b13d3165db9f4c0668.camel@redhat.com>
On Wed, Sep 20, 2023 at 07:48:22PM +0200, Thomas Haller wrote:
> On Wed, 2023-09-20 at 18:02 +0200, Pablo Neira Ayuso wrote:
> > On Wed, Sep 20, 2023 at 04:26:09PM +0200, Thomas Haller wrote:
> >
> > > + enum ops op;
> >
> > This is saving _a lot of space_ for us, we currently have a problem
> > with memory consumption, this is going in the opposite direction.
> >
> > I prefer to ditch this patch.
>
> The packed enums are only one uint8_t large. The memory-saving compared
> to a :8 bitfield is exactly the same.
I see, I am not sure yet I want to give control to the compiler on the
layout of these structures, I have been using pahole to shrink them
further, specifically struct expr is critical (I have at least one
patch to reduce the size of constant expressions to safe % memory with
very 13.5%. And location for error reporting is still consuming 48
bytes per struct expr.
next prev parent reply other threads:[~2023-09-20 18:08 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-20 14:26 [PATCH nft 0/9] various cleanups related to enums and struct datatype Thomas Haller
2023-09-20 14:26 ` [PATCH nft 1/9] src: fix indentation/whitespace Thomas Haller
2023-09-20 16:03 ` Pablo Neira Ayuso
2023-09-20 14:26 ` [PATCH nft 2/9] include: fix missing definitions in <cache.h>/<headers.h> Thomas Haller
2023-09-20 14:26 ` [PATCH nft 3/9] datatype: drop flags field from datatype Thomas Haller
2023-09-20 18:10 ` Pablo Neira Ayuso
2023-09-20 19:23 ` Thomas Haller
2023-09-21 14:23 ` Pablo Neira Ayuso
2023-09-22 8:51 ` Thomas Haller
2023-09-22 11:18 ` Pablo Neira Ayuso
2023-09-20 14:26 ` [PATCH nft 4/9] datatype: use "enum byteorder" instead of int in set_datatype_alloc() Thomas Haller
2023-09-20 16:27 ` Pablo Neira Ayuso
2023-09-20 14:26 ` [PATCH nft 5/9] payload: use enum icmp_hdr_field_type in payload_may_dependency_kill_icmp() Thomas Haller
2023-09-20 16:32 ` Pablo Neira Ayuso
2023-09-20 14:26 ` [PATCH nft 6/9] netlink: handle invalid etype in set_make_key() Thomas Haller
2023-09-20 16:22 ` Pablo Neira Ayuso
2023-09-20 16:24 ` Pablo Neira Ayuso
2023-09-20 14:26 ` [PATCH nft 7/9] expression: cleanup expr_ops_by_type() and handle u32 input Thomas Haller
2023-09-20 18:13 ` Pablo Neira Ayuso
2023-09-20 19:28 ` Thomas Haller
2023-09-21 14:19 ` Pablo Neira Ayuso
2023-09-22 8:54 ` Thomas Haller
2023-09-22 9:56 ` Pablo Neira Ayuso
2023-09-25 8:44 ` Pablo Neira Ayuso
2023-09-20 14:26 ` [PATCH nft 8/9] datatype: use __attribute__((packed)) instead of enum bitfields Thomas Haller
2023-09-20 16:02 ` Pablo Neira Ayuso
2023-09-20 17:48 ` Thomas Haller
2023-09-20 18:07 ` Pablo Neira Ayuso [this message]
2023-09-20 16:46 ` Pablo Neira Ayuso
2023-09-20 14:26 ` [PATCH nft 9/9] proto: add missing proto_definitions for PROTO_DESC_GENEVE Thomas Haller
2023-09-20 16:14 ` Pablo Neira Ayuso
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