From: Bruce Richardson <bruce.richardson@intel.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [RFC 4/4] net/ether: use bitops to speedup comparison
Date: Thu, 16 May 2019 17:03:37 +0100 [thread overview]
Message-ID: <20190516160337.GA632@bricha3-MOBL.ger.corp.intel.com> (raw)
In-Reply-To: <20190515221952.21959-5-stephen@networkplumber.org>
On Wed, May 15, 2019 at 03:19:52PM -0700, Stephen Hemminger wrote:
> Using bit operations like or and xor is faster than a loop
> on all architectures. Really just explicit unrolling.
>
> Similar cast to uint16 unaligned is already done in
> other functions here.
>
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> ---
> lib/librte_net/rte_ether.h | 17 +++++++----------
> 1 file changed, 7 insertions(+), 10 deletions(-)
>
Rather than casting to unaligned values, which gives compiler warnings in
some cases, I believe we should just mark the ethernet addresses as always
being 2-byte aligned and simplify things. [unless we have a good use case
where we won't have 2-byte alignment???].
See patch: http://patches.dpdk.org/patch/53482/
Regards,
/Bruce
next prev parent reply other threads:[~2019-05-16 16:03 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-15 22:19 [dpdk-dev] [RFC 0/4] net/ether: improvements Stephen Hemminger
2019-05-15 22:19 ` Stephen Hemminger
2019-05-15 22:19 ` [dpdk-dev] [RFC 1/4] net/ether: deinline non-critical functions Stephen Hemminger
2019-05-15 22:19 ` Stephen Hemminger
2019-05-16 7:10 ` David Marchand
2019-05-16 7:10 ` David Marchand
2019-05-15 22:19 ` [dpdk-dev] [RFC 2/4] net/ether: add eth_unformat_addr Stephen Hemminger
2019-05-15 22:19 ` Stephen Hemminger
2019-05-16 7:28 ` David Marchand
2019-05-16 7:28 ` David Marchand
2019-05-15 22:19 ` [dpdk-dev] [RFC 3/4] ethdev: use eth_unformat_addr Stephen Hemminger
2019-05-15 22:19 ` Stephen Hemminger
2019-05-16 7:32 ` David Marchand
2019-05-16 7:32 ` David Marchand
2019-05-16 10:19 ` Bruce Richardson
2019-05-16 10:19 ` Bruce Richardson
2019-05-15 22:19 ` [dpdk-dev] [RFC 4/4] net/ether: use bitops to speedup comparison Stephen Hemminger
2019-05-15 22:19 ` Stephen Hemminger
2019-05-16 9:03 ` Mattias Rönnblom
2019-05-16 9:03 ` Mattias Rönnblom
2019-05-16 15:32 ` Stephen Hemminger
2019-05-16 16:03 ` Bruce Richardson [this message]
2019-05-16 16:06 ` Stephen Hemminger
2019-05-16 16:07 ` Bruce Richardson
2019-05-16 16:36 ` Bruce Richardson
2019-05-16 17:04 ` Stephen Hemminger
2019-05-16 20:37 ` Bruce Richardson
2019-05-16 20:41 ` Bruce Richardson
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