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Block layer discard requests

Block layer discard requests

Posted Aug 19, 2008 9:39 UTC (Tue) by seanyoung (subscriber, #28711)
In reply to: Block layer discard requests by jlokier
Parent article: Block layer discard requests 

You say writes submitted after the discard will not be merged before the barrier. 

So say we have 100 of files being deleted on a FAT filesystem. After each file deletion a
discard (i.e. BARRIER) is submitted. 

Now in stead of writing the FAT table changes once at the end, the FAT table changes must be
written 100 times.

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Block layer discard requests

Posted Aug 19, 2008 16:47 UTC (Tue) by jlokier (guest, #52227) [Link] 

Writes were never merged by the device request queue anyway.

Merging the FAT table writes happens at a higher level: in the FAT filesystem.  That's not
affected by these changes.  The FAT filesystem will submit a series of DISCARD requests for
each deleted file, interspersed with a smaller number of FAT write requests which merge
multiple changes.


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