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| /freebsd-11-stable/sys/kern/ | ||
| H A D | vfs_cluster.c | diff 250327 Tue May 07 06:23:57 MDT 2013 scottl Add a sysctl vfs.read_min to complement the exiting vfs.read_max. It defaults to 1, meaning that it's off. When read-ahead is enabled on a file, the vfs cluster code deliberately breaks a read into 2 I/O transactions; one to satisfy the actual read, and one to perform read-ahead. This makes sense in low-latency circumstances, but often produces unbalanced i/o transactions that penalize disks. By setting vfs.read_min, we can tell the algorithm to fetch a larger transaction that what we asked for, achieving the same effect as the read-ahead but without the doubled, unbalanced transaction and the slightly lower latency. This significantly helps our workloads with video streaming. Submitted by: emax Reviewed by: kib Obtained from: Netflix |
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