Hi folks,
I have compiled kernel 3.1 rc7 under Fedora 15.
Compiling the kernel drive me into a several question.
I tought that if I remove support for hardware that I wont use it would improve performance (at least boot time ). But booting from my new kernel (instead of the 'old' fedora kernel) take much more time.
So I discovered that my initramfs file was to large. About 112 MB. Fedora intramfs is about 15Mb.
Basically my questions are:
1) If I remove SCSI support from kernel, would it improve performace? More generally what improve performace in linux kernel. It is possible to improve performace just by removing itens?
2)Why my initramfs is too big? I unselect a lot o stuff that I wont use. It is possible to make a intramsfs of 1MB ?
Hi Jo�o,
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On 09/30/2011 01:55 PM, Jo�o Daniel Neves wrote:
So I discovered that my initramfs file was to large. About 112 MB. Fedora intramfs is about 15Mb.
When using dracut to create initramfs images the default is to create a generic image with all available kernel modules that could be required to boot a system.
Basically my questions are:
- If I remove SCSI support from kernel, would it improve performace?
More generally what improve performace in linux kernel. It is possible to improve performace just by removing itens?
No - most likely you would not be able to measure a difference. You would also lose support for lots of common and useful hardware like ata hard disks, most CD-ROMs/DVDs etc. and USB storage since these all use the SCSI infrastructure in the kernel.
2)Why my initramfs is too big? I unselect a lot o stuff that I wont use. It is possible to make a intramsfs of 1MB ?
The -H/--hostonly options cause dracut to only include the set of modules that are needed to boot the running system (i.e. the image is tailored to the host on which dracut is run).
Regards, Bryn.
-
Bryn M. Reeves -
Joao Daniel Neves