On 06/14/2011 05:06 PM, Lauri Kasanen wrote: > Hi > > I replaced bb modprobe with the latest module-init-tools one (3.16) and > ran the mod-init-tools depmod (to generate the .bin files). > Rather curiously, doing that dropped 28% off the boot time ;) Consider > this issue confirmed. > > I then removed the .bin files, to test the full modprobe with the same > alias files as bb. The boot was still 23% faster than with bb modprobe. > > Bootchart 1, module-init-tools + bin: > http://www.shareapic.net/Zoom-25083078-TC.html > Bootchart 2, module-init-tools: > http://www.shareapic.net/Zoom-25083079-TC.html > > So there's obviously something else besides the bin files going on. I > guess I'll record all the calls to modprobe, to get a test set.
Could you try changing busybox to use getc_unlocked? I suspect you have thread capable libc/uclibc and they are doing a lot of locking. Locking is cpu-wise expensive operation. Especially in this case as the lock is reacquired for *every character* in the dependency file. That's only thing I can think of what could be going differently. And this would be issue in the config_* function on libbb. And causing performance issues in multiple other places too. _______________________________________________ busybox mailing list [email protected] http://lists.busybox.net/mailman/listinfo/busybox
