Linus: Actually, just yesterday we had a git performance issue, where ZFS was orders of magnitude slower than UFS for one user (not under Linux, but git is gaining a lot of traction even outside of kernel development). So I think a lot of the ‘new file system’ mania is partly fed by knowing about the issues with old filesystems, and then the (somewhat unrealistic) expectation that a ‘new and improved’ filesystem will make everything perfect.

In the end, this is one area where you just let people fight it out. See who comes out the winner — and it doesn’t need to be (and likely will not) be a single winner. Almost always, the right choice of file system ends up depending on the load and circumstances.

One thing that I’m personally more excited about than any of the filesystems you mention is actually the fact that Flash-based hard disks are quickly becoming available even for ‘normal’ users. Sure, they’re still expensive (and fairly small), but Flash-based storage has such a different performance profile from rotating media, that I suspect that it will end up having a large impact on filesystem design. Right now, most filesystems tend to be designed with the latencies of rotating media in mind.

Q: Why do you think CFS is better than SD?

Linus: Part of it is that I have worked with Ingo [Molnar] for a long time, which means that I know him, and know that he’ll be very responsive to any issues that come up. That kind of thing is very important.

But part of it is simply about numbers. Most people out there actually say that CFS is better than SD. Including, very much, on 3D games (which people claimed was a strong point of SD).

At the same time, though, I don’t think any piece of code is ever ”perfect”. The best thing to happen is that the people who want to be proponents of SD will try to improve that so much that the balance tips over the other way — and we’ll keep both camps trying interesting things because the internal competition motivates them.

哪个大牛不顺眼把这个给改了!….

2.6.22
grep “generic_sy” include/linux/fs.h
extern void generic_sync_sb_inodes(struct super_block *, struct writeback_control *);

2.6.23

extern int generic_sync_sb_inodes(struct super_block *, struct writeback_control *);

从mm2里面抽的reiser4不错,能编译…

未经严格检测

另外踩一踩CFS的地雷…
感觉 SD 好像真有一点点问题一样.

当然,如果能给SD一个跑跑的机会也不错(不过不测也罢,SD主要对桌面)
4 不用gtalk可以用别的嘛…
psi,gajim,gaim(pidgin),加上google官方的方法,都能上.看了.
输你现在的mail就可以.

研究研究这个神奇的图?
http://people.freebsd.org/~jeff/sysbench.png

ps: 谁有8核服务器?

ps2: 看你用的是Google Apps,
上面有googletalk不?如有发邮件说明一下什么时候出没.