Messages in this thread | | | Date | Wed, 07 Mar 2007 07:57:14 +0100 | From | Eric Dumazet <> | Subject | Re: [patch v2] epoll use a single inode ... |
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Linus Torvalds a écrit : > > On Tue, 6 Mar 2007, Eric Dumazet wrote: >> I did a user space program, attached to this mail. >> >> I rewrote the reciprocal_div() for i386 so that one multiply is used. > > Ok, this is definitely faster on Core 2 as well, so "numbers talk, > bullshit walks". No more objections.
And the numbers were ? :)
> > (That said, I bet you could do even better for octal and hex numbers, so > if you *really* want to speed things up, you should just make a > special-case routine for each base (there's just three of them), and you > can then also optimize the base-10 thing much better (you can do two > digits at a time by dividing by 100, etc)
Well, given that sprintf() is frequently called only for pipe/sockets creation, we probably better :
1) wait a very clever idea to suppress individual dentry per pipe/sockets (no more sprintf() at pipe/socket setup)
2) delay the sprintf() only if needed as you mentioned in a previous mail (when someone wants ls -l /proc/pid/fd/....), since their dentries are not anymore inserted in the global dcache hash, they could stay with a (nul) dname.
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