Re: 2.4.19rc2aa1

[J.A. Magallon]

On 2002.07.18 Andrea Arcangeli wrote:
>I would appreciate any feedback on the last patches for the i_size
>atomic accesses on 32bit archs. Thanks,
>
>URL:
>
>	http://www.us.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.19rc2aa1.gz
>	http://www.us.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.19rc2aa1/
>
>diff between 2.4.19rc1aa2 and 2.4.19rc1aa2:
>
>Only in 2.4.19rc1aa2: 000_e100-2.0.30-k1.gz
>Only in 2.4.19rc2aa1: 000_e100-2.1.6.gz
>Only in 2.4.19rc1aa2: 000_e1000-4.2.17-k1.gz
>Only in 2.4.19rc2aa1: 000_e1000-4.3.2.gz
>

More on this.

We have two interfaces:
04:04.0 Ethernet controller: Intel Corp. 82557 [Ethernet Pro 100] (rev 08)
03:01.0 Ethernet controller: Intel Corp. 82543GC Gigabit Ethernet Controller (rev 02)

NetPipe (tcp) shows numbers like 80Mb/s for e100 and 500Mb/s for e1000. So
efficiency is much much higher for e100 driver+card than e1000.
I have to dig, perhaps e100 is doing zerocopy and e1000 is not ?

Any ideas ?

-- 
J.A. Magallon             \   Software is like sex: It's better when it's free
mailto:[e-mail]  \                    -- Linus Torvalds, FSF T-shirt
Linux werewolf 2.4.19-rc2-jam1, Mandrake Linux 8.3 (Cooker) for i586
gcc (GCC) 3.1.1 (Mandrake Linux 8.3 3.1.1-0.8mdk)