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While the PV SCSI SG list can handle 512k of SG entries, it can only do so for I/O that's aligned to 4k or better. newfs_msdos does unaligned I/O, so triggers too long for host errors in cam when a 512k I/O is attempted. Prefer power of 2 256k to the absolute maximum 508k, though that can be revisited should the latter show to give significant performance improvement. MFC After: 3 days Tested by: darius on discord (508k version of patch) Sponsored by: Netflix |
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