Messages in this thread | | | Date | Wed, 28 Sep 2005 12:29:34 -0700 (PDT) | From | Wilson Li <> | Subject | Slow loading big kernel module in 2.6 on PPC platform |
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Hi,
I am trying to port several third party kernel modules from kernel 2.4 to 2.6 on a ppc (MPC824x) platform. For small size of modules, it works perfectly in 2.6. But there's one huge kernel module which size is about 2.7M bytes (size reported by lsmod after insmod), and it takes about 90 seconds to load this module before init_module starts. I did not notice there's such obvious delay in 2.4 kernel.
Initially I suspected there might be a problem of the insmod of busybox I was using. I switched to module-init-tools-3.1 insmod. It didn't help. I also tried other things like disabling CONFIG_KALLSYMS and commenting out all the EXPORT_SYMBOLs in that module. Nothing works so far. I've not been able to find any relevant thread about slow loading of big kernel module on PPC platform.
Is this related to the new way of loading kernel module in 2.6 or vmalloc since the kernel module also needs contiguous memory? I am running 2.6.8 kernel on a ppc platform (MPC824x) with 24M bytes memory visible to kernel. Two small kernel modules are loaded first through shell command right after system boots up. And there are about 10M bytes free memory left before loading this big chunk. The memory seems big enough to me and memory is not that fragmented since it just boots up.
Any suggestions?
Thanks a lot, Wilson Li
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