ext4 testing in the F10 release cycle

Eric Sandeen sandeen at redhat.com
Thu Sep 4 01:04:34 UTC 2008


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
> 




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