?? raid5-large-io.patch
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This patch changes max request size to <chunk size> * <disks>in order to allow Lustre to submit large I/Os and avoidunnecessary reads.Index: linux-2.6.9/drivers/md/raid5.c===================================================================--- linux-2.6.9.orig/drivers/md/raid5.c 2006-05-22 00:01:30.000000000 +0400+++ linux-2.6.9/drivers/md/raid5.c 2006-05-22 00:09:56.000000000 +0400@@ -1609,6 +1609,11 @@ static int run (mddev_t *mddev) mddev->queue->unplug_fn = raid5_unplug_device; mddev->queue->issue_flush_fn = raid5_issue_flush; + /* in order to support large I/Os */+ blk_queue_max_sectors(mddev->queue, mddev->chunk_size * mddev->raid_disks >> 9);+ mddev->queue->max_phys_segments = mddev->chunk_size * mddev->raid_disks >> PAGE_SHIFT;+ mddev->queue->max_hw_segments = mddev->chunk_size * mddev->raid_disks >> PAGE_SHIFT;;+ PRINTK("raid5: run(%s) called.\n", mdname(mddev)); ITERATE_RDEV(mddev,rdev,tmp) {?? 快捷鍵說明
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