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Block layer discard requestsBlock layer discard requestsPosted 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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