Hello Tinti, Thank you for the reply. On Tuesday 02 December 2014 05:21 PM, Vinícius Tinti wrote: > On Tue, Dec 2, 2014 at 7:08 AM, Raghavendra <arrao@xxxxxxx> wrote: >> Hello all, >> >> I am using Ubuntu-12.04 which came with 3.2 kernel. Parallel to this, >> I've compiled and installed 3.12.1 kernel using the Ubuntu-3.2's >> configuration, and the compiler which came with the distro. I've noticed >> that there is a huge difference in the size of the .ko file between the >> Ubuntu's kernel and the kernel which I've compiled. Sample results are : >> >> $ du -sh usb-storage.ko >> It shows : 56K for the Ubuntu's 3.2 kernel >> 1.3M for the custom kernel that I've compiled >> >> I've tested the same thing for a simple hello world module : >> $ du -sh hello.ko >> It shows : 4.0k for the Ubuntu's 3.2 kernel >> 56k for the custom kernel that I've compiled >> >> What could be the reason for this huge amount of difference of storage >> space in spite of using the same config file and compiler? > Are you sure that you have build with the same optimization flags? > > I guess that "-O2" is missing in the big example. Could you double check? Actually, I haven't use any optimization flags. I've just hit 'make' from the command line while compiling for both the kernels. I even checked the Makefile of both the kernels. -O2 flag is used in the same way in both the Makefiles. Regards, Raghavendra > > Regards > >> Thanks in advance. >> >> Raghavendra >> >> ------------------------------------------------------------------------------------------------------------------------------- >> [ C-DAC is on Social-Media too. Kindly follow us at: >> Facebook: https://www.facebook.com/CDACINDIA & Twitter: @cdacindia ] >> >> This e-mail is for the sole use of the intended recipient(s) and may >> contain confidential and privileged information. If you are not the >> intended recipient, please contact the sender by reply e-mail and destroy >> all copies and the original message. Any unauthorized review, use, >> disclosure, dissemination, forwarding, printing or copying of this email >> is strictly prohibited and appropriate legal action will be taken. >> ------------------------------------------------------------------------------------------------------------------------------- >> >> >> _______________________________________________ >> Kernelnewbies mailing list >> Kernelnewbies@xxxxxxxxxxxxxxxxx >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ------------------------------------------------------------------------------------------------------------------------------- [ C-DAC is on Social-Media too. Kindly follow us at: Facebook: https://www.facebook.com/CDACINDIA & Twitter: @cdacindia ] This e-mail is for the sole use of the intended recipient(s) and may contain confidential and privileged information. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies and the original message. Any unauthorized review, use, disclosure, dissemination, forwarding, printing or copying of this email is strictly prohibited and appropriate legal action will be taken. ------------------------------------------------------------------------------------------------------------------------------- _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
