Ext4 Developer Interlock Call
October 22, 2007: Meeting Minutes
Attendees: Mingming Cao, Andreas Dilger, Eric Sandeen, Dave Kleikamp,
Jose Santos, Aneesh Veetil, Valerie Clement, Avantika Mathur
- There has been discussion on linux-ext4 about overflow in ext2 with 64
KB block size. Discussed adding an incompat flag to this feature and
concluded that it is too late to do this; it will be treated as a bug fix.
Patch Status: patches that were not picked up to mainline in the recent
pull:
- journal_checksum patches - the fsstress kernel oops is not yet
resolved, Avantika will be working on this.
- i_version: Jean-Noel recently sent out an updated version which adds a
lock every time i_version is updated. Still waiting on more review
- mballoc - target for next kernel release. Remaining work:
- Aneesh plans to run some performance test and include results in
the patch description.
- Waiting for Alex to address the fixme's that aneesh has added to
the code, for more clarification.
- block groupdescriptor sync with e2fsprogs:
- Aneeesh recently posted patches which have been added to the patch queue.
E2fsprogs
- Ted has added new branches the the e2fsprogs git tree
- master: current stable version
- next: patches expected to go into the next stable version
- pu: proposed update; patches that are in preliminary review and
test phase
- E2fsprogs patches should probably be submitted against the 'next'
branch of the git tree.
- Aneesh was looking for patches to support mke2fs of large
filesystems. Valerie's old patches don't apply cleanly.
- Documentation in the kernel tree; ext4.txt is out of date and needs to
be updated.
Performance:
- Andreas had asked Chris Mason to add ext4 to his BTRfs benchmarks.
Chris Mason reported that ext4 is doing poorly on a test which performs
kernel untar and compile on 20 kernels in a row. The performance of
ext4 on reads is poor compared to ext3.
- Eric will talk to Chris and get all of the details of the tests.
- Eric suggested enabling delalloc,mballoc mount options by default.
The dellaloc option can then be disabled if the fs is not in writeback
journaling mode.
-
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