Re: [PATCH RFC] block, bfq: set default slice_idle to zero for non-rotational devices

2018-11-02 Thread Paolo Valente
> Il giorno 1 nov 2018, alle ore 22:06, Holger Hoffstätte > ha scritto: > > On 11/01/18 18:43, Konstantin Khlebnikov wrote: >> With default 8ms idle slice BFQ is up to 10 times slower than CFQ >> for massive random read workloads for common SATA SSD. >> For now zero idle slice gives better ou

Re: [PATCH RFC] block, bfq: set default slice_idle to zero for non-rotational devices

2018-11-01 Thread Holger Hoffstätte
On 11/01/18 18:43, Konstantin Khlebnikov wrote: With default 8ms idle slice BFQ is up to 10 times slower than CFQ for massive random read workloads for common SATA SSD. For now zero idle slice gives better out of box experience. CFQ employs this since commit 41c0126b3f22 ("block: Make CFQ defaul

[PATCH RFC] block, bfq: set default slice_idle to zero for non-rotational devices

2018-11-01 Thread Konstantin Khlebnikov
With default 8ms idle slice BFQ is up to 10 times slower than CFQ for massive random read workloads for common SATA SSD. For now zero idle slice gives better out of box experience. CFQ employs this since commit 41c0126b3f22 ("block: Make CFQ default to IOPS mode on SSDs") Signed-off-by: Konstanti