On Tue, Dec 2, 2014 at 10:50 AM, Vinícius Tinti <viniciustinti@xxxxxxxxx> wrote: > On Tue, Dec 2, 2014 at 10:37 AM, Raghavendra <arrao@xxxxxxx> wrote: >> 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. > > Strange. Can you try this? Opps. http://stackoverflow.com/questions/1999654/how-can-i-tell-if-a-library-was-compiled-with-g Maybe there are debug symbols in one of the kernels. Dunno. > >> 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. >> ------------------------------------------------------------------------------------------------------------------------------- >> > > > > -- > Simplicity is the ultimate sophistication -- Simplicity is the ultimate sophistication _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
