On 4/3/11 12:01 PM, Zeev Tarantov wrote:
> On Sun, Apr 3, 2011 at 21:56, Eric Sandeen <sandeen@xxxxxxxxxx> wrote:
>> On 4/3/11 11:52 AM, Zeev Tarantov wrote:
>>> If the filesystem created with the default options is slow or has
>>> higher cpu usage, it should be changed.
>>
>> I agree. For actual striped storage, this makes it faster, but this
>> case is a problem; block-sized stripe width is never going to be good.
>> What device is this, exactly?
>
> Look in linux-2.6/drivers/staging/zram/zram.txt
OK, so it does:
/*
* To ensure that we always get PAGE_SIZE aligned
* and n*PAGE_SIZED sized I/O requests.
*/
blk_queue_physical_block_size(zram->disk->queue, PAGE_SIZE);
blk_queue_logical_block_size(zram->disk->queue,
ZRAM_LOGICAL_BLOCK_SIZE);
blk_queue_io_min(zram->disk->queue, PAGE_SIZE);
blk_queue_io_opt(zram->disk->queue, PAGE_SIZE);
These are all documented in Documentation/ABI/testing/sysfs-block.
I don't think that setting all those values in zram is necessary and/or
sufficient to achieve what is desired in the comment. io_min/io_opt
generally are set only for striped devices.
Still, mke2fsprogs should probably sanity-check for this; I'll make
sure this seems right, and send a patch.
Thanks,
-Eric
>> -Eric (losing my free airport wifi in about 8 minutes, so I may have
>> to continue this later...!)
>>
>>>> -Eric
>>>
>>> -Z.T.
>>
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