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Limit max_hw_sectors_kb to 16M

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When support for large blocks was added DMU_MAX_ACCESS was increased
to allow for blocks of up to 16M to fit in a transaction handle.
This had the side effect of increasing the max_hw_sectors_kb for
volumes, which are scaled off DMU_MAX_ACCESS, to 64M from 10M.

This is an issue for volumes which by default use an 8K block size
because it results in dmu_buf_hold_array_by_dnode() allocating a
64K array for the dbufs.  The solution is to restore the maximum
size to ~10M.  This patch specifically changes it to 16M which is
close enough.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3684
This commit is contained in:
Brian Behlendorf 2015-08-27 17:01:59 -07:00
parent 5475aada94
commit c495fe2c1c
1 changed files with 1 additions and 1 deletions
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2
module/zfs/zvol.c
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@ -1389,7 +1389,7 @@ __zvol_create_minor(const char *name, boolean_t ignore_snapdev)
set_capacity(zv->zv_disk, zv->zv_volsize >> 9);
blk_queue_max_hw_sectors(zv->zv_queue, DMU_MAX_ACCESS / 512);
blk_queue_max_hw_sectors(zv->zv_queue, (DMU_MAX_ACCESS / 4) >> 9);
blk_queue_max_segments(zv->zv_queue, UINT16_MAX);
blk_queue_max_segment_size(zv->zv_queue, UINT_MAX);
blk_queue_physical_block_size(zv->zv_queue, zv->zv_volblocksize);