Messages in this thread | | | Date | Tue, 4 Nov 2003 08:49:28 +0100 | From | Jens Axboe <> | Subject | Re: CONFIG_IOSCHED_CFQ |
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On Sun, Oct 26 2003, ahuisman wrote: > wuuk:/boot# diff config-2.6.0-test8-mm1 config-2.6.0-test9 > 33d32 > < CONFIG_IOSCHED_CFQ=y > 87,91d85 > < # CONFIG_X86_4G is not set > < # CONFIG_X86_SWITCH_PAGETABLES is not set > < # CONFIG_X86_4G_VM_LAYOUT is not set > < # CONFIG_X86_UACCESS_INDIRECT is not set > < # CONFIG_X86_HIGH_ENTRY is not set > 111d104 > < CONFIG_BOOT_IOREMAP=y > 257d249 > < # CONFIG_BLK_DEV_SGIIOC4 is not set > 302a295 > > # CONFIG_SCSI_SATA is not set > 483d475 > < # CONFIG_NET_POLL_CONTROLLER is not set > > Conclusion: > > CONFIG_IOSCHED_CFQ is removed from 2.6.0-test9 > > Questions: > > Am i right with my conclusion ? > Is this the reason for the loss of performance ?
No you are not correct, must be caused by something else. Just building CFQ into the kernel doesn't enable it, you need to boot with elevator=cfq for that to happen. So whether CONFIG_IOSCHED_CFQ is set or not cannot make a difference by itself.
The performance difference must be caused by some other change between test8-mm1 and -test9.
-- Jens Axboe
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