D32251.diff
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D32251.diff
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	diff --git a/stand/common/bcache.c b/stand/common/bcache.c
	--- a/stand/common/bcache.c
	+++ b/stand/common/bcache.c
	@@ -86,8 +86,9 @@
	#define BHASH(bc, blkno) ((blkno) & ((bc)->bcache_nblks - 1))
	#define BCACHE_LOOKUP(bc, blkno) \
	((bc)->bcache_ctl[BHASH((bc), (blkno))].bc_blkno != (blkno))
	-#define BCACHE_READAHEAD 256
	+#define BCACHE_READAHEAD 512
	#define BCACHE_MINREADAHEAD 32
	+#define BCACHE_MAXIOWRA 512

	static void bcache_invalidate(struct bcache *bc, daddr_t blkno);
	static void bcache_insert(struct bcache *bc, daddr_t blkno);
	@@ -324,6 +325,8 @@
	if (ra != 0 && ra != bc->bcache_nblks) { /* do we have RA space? */
	ra = MIN(bc->ra, ra - 1);
	ra = rounddown(ra, 16); /* multiple of 16 blocks */
	+ if (ra + p_size > BCACHE_MAXIOWRA)
	+ ra = BCACHE_MAXIOWRA - p_size;
	bc->ralen = ra;
	p_size += ra;
	} else {