Fix zfs_dirty_data_max overflow on 32-bit
On 32 bit, the calculation of zfs_dirty_data_max from phymem will overflow, causing it to be smaller than zfs_dirty_data_sync, and will cause txg being delayed while no one write to disk. The end result is horrendous write speed. On 4G ram 32-bit VM, before this patch, simple dd results in ~7MB/s. Now it can reach speed on par with 64-bit VM. Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3973
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@ -5479,11 +5479,11 @@ arc_init(void)
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* zfs_dirty_data_max_max (default 25% of physical memory).
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*/
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if (zfs_dirty_data_max_max == 0)
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zfs_dirty_data_max_max = physmem * PAGESIZE *
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zfs_dirty_data_max_max = (uint64_t)physmem * PAGESIZE *
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zfs_dirty_data_max_max_percent / 100;
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if (zfs_dirty_data_max == 0) {
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zfs_dirty_data_max = physmem * PAGESIZE *
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zfs_dirty_data_max = (uint64_t)physmem * PAGESIZE *
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zfs_dirty_data_max_percent / 100;
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zfs_dirty_data_max = MIN(zfs_dirty_data_max,
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zfs_dirty_data_max_max);
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