On 10/22/2025 10:09 AM, Christoph Hellwig wrote: > On Tue, Oct 21, 2025 at 09:46:30AM +1100, Dave Chinner wrote: >> Not necessarily. The allocator can (and will) select different AGs >> for an inode as the file grows and the AGs run low on space. Once >> they select a different AG for an inode, they don't tend to return >> to the original AG because allocation targets are based on >> contiguous allocation w.r.t. existing adjacent extents, not the AG >> the inode is located in. > > Also, as pointed out in the last discussion of this for the RT > subvolume there is zero relation between the AG the inode is in > and the data placement. > > I evaluated the effect of parallel writeback on realtime inodes and observed no improvement in IOPS. We can limit writes for realtime inodes to utilize a single default (0) writeback context. Do you see it differently?
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