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Use the vdev's ashift to calculate the supported min block size passed to

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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.

MFC after:	2 days
This commit is contained in:
Steven Hartland 2013-10-22 13:31:36 +00:00
parent 8ec5ab3f16
commit 70c3432663
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=256889
1 changed files with 1 additions and 1 deletions
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2
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
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@ -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 */