ext4 testing in the F10 release cycle

[Eric Sandeen]

Eric Sandeen wrote:
> Chris Snook wrote:
>> Eric Sandeen wrote:
>>> Peter Robinson wrote:
>>>
>>>> Do you have recommended FS creation parameters for SSDs?
>>> Not really; there has unfortunately been very little (or no)
>>> optimization of ext4 for SSDs at this point ...
>>>
>>> It'd probably be an allocator heuristic change but nobody's looked into
>>> that yet.
>>>
>>> Once we get ext4 raid-geometry-aware, we can probably use some of that
>>> geometry info to better match up with the erase block sizes on an SSD at
>>> least...
>> In my testing (without a filesystem), raid-optimized access works quite well on 
>> SSDs, so that should carry over quite effortlessly.  The places where we need 
>> work are:
>>
>> a)	Make jbd do fewer small writes.
>>
>> b)	Write a partitioning tool that doesn't suck the way fdisk and parted do, so 
>> we can partition properly for the geometry of modern storage.
> 
> parted and fdisk can do 512-byte sector granularity; what do you need here?
> 
>> c)	Put an alignment option in the installer, so people can optimize their 
>> partitions and filesystems for SSDs, RAID, and anything else where alignment 
>> matters.
> 
> mkfs should be doing this, not the installer.  mkfs.xfs does;
> mkfs.ext$FOO should too.
> 
> -Eric
> 
>> -- Chris
>>
>