On 03/03/2011 09:42 AM, Heiko Carstens wrote:
> I leave it up to Stefan W. and Stefan H. to make comments to your
> suggestion. Thanks!
>
also, why deadline over cfq ?
_old_ IBM papers show a little gain of deadline in _some_ cases, but *today* ??
-thanks-
> Full quote:
>
>> hi,
>>
>> udev can handle it, as do 60-readahead.rules with read_ahead_kb
>> in s390-tools.
>>
>> change part of this, drivers/s390/block/dasd.c:
>>
>> /*
>> * Allocate and initialize request queue and default I/O scheduler.
>> */
>> static int dasd_alloc_queue(struct dasd_block *block)
>> {
>> int rc;
>>
>> block->request_queue = blk_init_queue(do_dasd_request,
>> &block->request_queue_lock);
>> if (block->request_queue == NULL)
>> return -ENOMEM;
>>
>> block->request_queue->queuedata = block;
>>
>> elevator_exit(block->request_queue->elevator);
>> block->request_queue->elevator = NULL;
>> rc = elevator_init(block->request_queue, "deadline");
>> if (rc) {
>> blk_cleanup_queue(block->request_queue);
>> return rc;
>> }
>> return 0;
>> }
>>
>>
>> for this other, 61-scheduler.rules :
>>
>> #
>> # Rules to change the default scheduler to deadline
>> # This file should be installed in /etc/udev/rules.d
>> #
>>
>> SUBSYSTEM!="block", GOTO="ra_end"
>>
>> ACTION!="add", GOTO="ra_end"
>> # on device add change the default scheduler to deadline
>> KERNEL=="sd*[!0-9]", ATTR{queue/scheduler}="deadline"
>> KERNEL=="dasd*[!0-9]", ATTR{queue/scheduler}="deadline"
>>
>> LABEL="ra_end"
>>
>>
>> simpler, more flexible and less C code.
>>
>> -thanks-
>
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