Re: Bizarre x86 segment layout problem causing select() slowdown: solved, sort of
Re: Bizarre x86 segment layout problem causing select() slowdown: solved, sort of
- Subject: Re: Bizarre x86 segment layout problem causing select() slowdown: solved, sort of
- From: Greg Guerin <email@hidden>
- Date: Wed, 7 Feb 2007 13:12:03 -0700
Dave Hayden wrote:
>Looking at the code again, I noticed this in the socket setup code:
>
> setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (void*)32768, sizeof(int));
>
>Now, I could swear when I added that line the default buffer was less
>than 32K, but in 10.4.8 the default appears to be 64K. When I replace
>32768 with 65535, the problem goes away.
Another point: 65535 isn't 64K, it's 64K - 1. That means it's odd.
32768, OTOH, is even, so it's possible the odd address was quietly ignored,
while the even one was accepted. Also plausible is that the int at address
65535 differs substantially from that at 32768, alignment issues aside.
-- GG
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