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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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