Alan Cox wrote:
Flush barriers are nightmare for more than enterprise. You drive basically goes for a hike for a bit which trashes interactivity as well. If the device can't do trim and the like without a drain I don't see much point doing it at all, except maybe to wait for idle devices and run a filesystem managed background 'strimmer' thread to just weed out now idle blocks that have stayed idle - eg by adding an inode of all the deleted untrimmed blocks and giving it an irregular empty ?
.. Agreed. And I believe Matthew also said something similar already. TRIM for the current (only!) SSDs needs to be a "batched, once in a while" operation, rather than something done continuously. And ideally, "once in a while" might be once a day, or once we have more than a significant percentage of the drive capacity ready for a TRIM. It needs to batch a lot of stuff into a single TRIM, and not do it very often at all. Cheers -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
