linux-kernel - Re: [PATCH net-next v3] arm: eBPF JIT compiler

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Message-ID: <b63fae4b-cb74-1928-b210-80914f3c8995@fb.com>
Date:   Sat, 19 Aug 2017 19:11:51 -0700
From:   Alexei Starovoitov <ast@...com>
To:     Shubham Bansal <illusionist.neo@...il.com>
CC:     Russell King - ARM Linux <linux@...linux.org.uk>,
        David Miller <davem@...emloft.net>,
        Network Development <netdev@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH net-next v3] arm: eBPF JIT compiler

On 8/19/17 2:46 PM, Shubham Bansal wrote:
> test_pkt_access:PASS:ipv4 271 nsec
> test_pkt_access:PASS:ipv6 297 nsec
> test_xdp:PASS:ipv4 961517 nsec     <--- Here is the difference.
> test_xdp:PASS:ipv6 615855 nsec     <--- Here is the difference.

yes. this is expected. These two numbers are single run
on cold cache, so there will be run-to-run variation.

> test_l4lb:PASS:ipv4 3049 nsec
> test_l4lb:PASS:ipv6 3906 nsec

These two and the first two were the ones I was interested in,
since they do many iterations over the same set and
the best to compare code gen changes.
The delta % is actually better than I expected judging by test_bpf
micro-benchmarks, so the results are very encouraging.

Thanks!