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MFC r256889:

Use the vdev's ashift to calculate the supported min block size passed to
zio_compress_data(..) when compressing l2arc buffers.

This eliminates L2ARC I/O errors, which resulted in very poor performance on
vdev's configured with block size greater than 512b due to compression
assuming a smaller min block size than the vdev supports.

Approved by:	re (glebius)
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commit 43cd197a0d5467cc3116e8b4d4190d5b88e73e61 1 parent 0fb83d0
smh authored
Showing with 1 addition and 1 deletion.
  1. +1 −1  sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
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2  sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
@@ -5147,7 +5147,7 @@ l2arc_compress_buf(l2arc_buf_hdr_t *l2hdr)
len = l2hdr->b_asize;
cdata = zio_data_buf_alloc(len);
csize = zio_compress_data(ZIO_COMPRESS_LZ4, l2hdr->b_tmp_cdata,
- cdata, l2hdr->b_asize, (size_t)SPA_MINBLOCKSIZE);
+ cdata, l2hdr->b_asize, (size_t)(1ULL << l2hdr->b_dev->l2ad_vdev->vdev_ashift));
if (csize == 0) {
/* zero block, indicate that there's nothing to write */
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