netdev - Re: [PATCH v2 net-next] inet: Get critical word in first 64bit of cache line

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Message-ID: <1359947488.30177.135.camel@edumazet-glaptop>
Date:	Sun, 03 Feb 2013 19:11:28 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ling Ma <ling.ma.program@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	maze@...gle.com
Subject: Re: [PATCH v2 net-next] inet: Get critical word in first 64bit of
 cache line

On Mon, 2013-02-04 at 10:53 +0800, Ling Ma wrote:
> I attached my test program(we force all cpu loads issue one by one ,
> and avoid cpu hardwre prefetch cc -o test-cwf test-cwf.c.) and
> cpu-info, the result from ./test-cwf  indicates as below:
> looking-up aligned time 157000272, looking-up unaligned time 162652724
> If I was wrong please correct me.

I have no idea why you use assembly code.

unsigned long lookingup_memmory(char *access, int num)
{
        __asm__("sub $1, %rsi");
        __asm__("xor %rax, %rax");
        __asm__("1:");
        __asm__("mov (%rdi), %r8");
        __asm__("add %r8, %rax");
        __asm__("mov %r8, %rdi");
        __asm__("sub $1, %rsi");
        __asm__("jae 1b");
}

Your program is really hard to read.


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