Re: [PATCH] fs: pipe/sockets/anon dentries should not have a parent

Ingo Molnar a écrit :

* Eric Dumazet [off-list ref] wrote:

quoted

Before patch, time to run 8 millions of close(socket()) calls on 8 CPUS was :

real    0m27.496s
user    0m0.657s
sys     3m39.092s

After patch :

real    0m23.997s
user    0m0.682s
sys     3m11.193s

cool :-)

What would it take to get it down to:

quoted

quoted

Cost if run one one cpu :

real    0m1.561s
user    0m0.092s
sys     0m1.469s

i guess asking for a wall-clock cost of 1.561/8 would be too much? :)

It might be possible, depending on the level of hackery I am allowed to inject
in fs/dcache.c and fs/inode.c :)

wall cost of 1.56 (each cpu runs one loop of one million iterations)