From: "Stanisław Kardach" <stanislaw.kardach@gmail.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: "Morten Brørup" <mb@smartsharesystems.com>,
"Bruce Richardson" <bruce.richardson@intel.com>,
dev@dpdk.org, "Liang Ma" <liangma@liangbit.com>,
"Punit Agrawal" <punit.agrawal@bytedance.com>,
"Pengcheng Wang" <wangpengcheng.pp@bytedance.com>,
"Chunsong Feng" <fengchunsong@bytedance.com>
Subject: Re: [PATCH 1/5] config/riscv: add flag for using Zbc extension
Date: Tue, 8 Oct 2024 07:52:42 +0200 [thread overview]
Message-ID: <CAJcPQBr-+HWRt2qK5Ksh8Y-9UTF1Z2N=J=Gv2dQKRNFy16ZmUA@mail.gmail.com> (raw)
In-Reply-To: <20241007082019.55d64b3b@hermes.local>
On Mon, Oct 7, 2024 at 5:20 PM Stephen Hemminger
<stephen@networkplumber.org> wrote:
>
> On Mon, 7 Oct 2024 10:14:22 +0200
> Stanisław Kardach <stanislaw.kardach@gmail.com> wrote:
>
> > > > >
> > > > > Please do not add more config options via compile flags.
> > > > > It makes it impossible for distros to ship one version.
> > That is a problem with RISC-V in general. Since all features are
> > "extensions" and there is no limit (up to a point) on the permutation
> > of those, we cannot statically build the code for all extensions.
> > Fortunately instructions tend to resolve to nops if an instruction is
> > not present but that still increases the code size for no benefit on
> > platforms without a given extension.
>
> X86 already has the cpu feature flag infrastructure, why not use similar
> mechanism on RiscV?
We can and some further patches I've seen on the list implemented
that. However if that has to be applied in basic intrinsics like
rte_prefetch() which means we'd have to pay a conditional or an
indirect call. It'd be best to test it on a real dataplane platform to
which I don't have access.
next prev parent reply other threads:[~2024-10-08 5:52 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-18 17:41 [PATCH 0/5] riscv: implement accelerated crc using zbc Daniel Gregory
2024-06-18 17:41 ` [PATCH 1/5] config/riscv: add flag for using Zbc extension Daniel Gregory
2024-06-18 20:03 ` Stephen Hemminger
2024-06-19 7:08 ` Morten Brørup
2024-06-19 14:49 ` Stephen Hemminger
2024-06-19 16:41 ` Daniel Gregory
2024-10-07 8:14 ` Stanisław Kardach
2024-10-07 15:20 ` Stephen Hemminger
2024-10-08 5:52 ` Stanisław Kardach [this message]
2024-10-08 15:35 ` Stephen Hemminger
2024-06-18 17:41 ` [PATCH 2/5] hash: implement crc using riscv carryless multiply Daniel Gregory
2024-06-18 17:41 ` [PATCH 3/5] net: " Daniel Gregory
2024-06-18 17:41 ` [PATCH 4/5] examples/l3fwd: use accelerated crc on riscv Daniel Gregory
2024-06-18 17:41 ` [PATCH 5/5] ipfrag: " Daniel Gregory
2024-07-12 15:46 ` [PATCH v2 0/9] riscv: implement accelerated crc using zbc Daniel Gregory
2024-07-12 15:46 ` [PATCH v2 1/9] config/riscv: detect presence of Zbc extension Daniel Gregory
2024-07-12 15:46 ` [PATCH v2 2/9] hash: implement crc using riscv carryless multiply Daniel Gregory
2024-07-12 15:46 ` [PATCH v2 3/9] net: " Daniel Gregory
2024-07-12 15:46 ` [PATCH v2 4/9] config/riscv: add qemu crossbuild target Daniel Gregory
2024-07-12 15:46 ` [PATCH v2 5/9] examples/l3fwd: use accelerated crc on riscv Daniel Gregory
2024-07-12 15:46 ` [PATCH v2 6/9] ipfrag: " Daniel Gregory
2024-07-12 15:46 ` [PATCH v2 7/9] examples/l3fwd-power: " Daniel Gregory
2024-07-12 15:46 ` [PATCH v2 8/9] hash/cuckoo: " Daniel Gregory
2024-07-12 15:46 ` [PATCH v2 9/9] member: " Daniel Gregory
2024-07-12 17:19 ` [PATCH v2 0/9] riscv: implement accelerated crc using zbc David Marchand
2024-08-27 15:32 ` [PATCH v3 " Daniel Gregory
2024-08-27 15:32 ` [PATCH v3 1/9] config/riscv: detect presence of Zbc extension Daniel Gregory
2024-08-27 15:32 ` [PATCH v3 2/9] hash: implement CRC using riscv carryless multiply Daniel Gregory
2024-08-27 15:32 ` [PATCH v3 3/9] net: " Daniel Gregory
2024-08-27 15:32 ` [PATCH v3 4/9] config/riscv: add qemu crossbuild target Daniel Gregory
2024-08-27 15:36 ` [PATCH v3 5/9] examples/l3fwd: use accelerated CRC on riscv Daniel Gregory
2024-08-27 15:36 ` [PATCH v3 6/9] ipfrag: " Daniel Gregory
2024-08-27 15:36 ` [PATCH v3 7/9] examples/l3fwd-power: " Daniel Gregory
2024-08-27 15:36 ` [PATCH v3 8/9] hash/cuckoo: " Daniel Gregory
2024-08-27 15:36 ` [PATCH v3 9/9] member: " Daniel Gregory
2024-09-17 14:26 ` [PATCH v3 0/9] riscv: implement accelerated crc using zbc Daniel Gregory
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