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7bd04f2d7d
It doesn't make sense for a zvol to use the default system I/O scheduler because it is a virtual device. Therefore, we change the default scheduler to 'noop' for zvols provided that the elevator_change() function is available. This interface has been available since Linux 2.6.36 and appears in the RHEL 6.x kernels. We deliberately do not implement the method for older kernels because it was racy and could result in system crashes. It's better to simply manually tune the scheduler for these kernels. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1017 |
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Makefile.in |