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| author | mav <mav@FreeBSD.org> | 2015-08-22 07:45:49 +0000 |
|---|---|---|
| committer | mav <mav@FreeBSD.org> | 2015-08-22 07:45:49 +0000 |
| commit | cb281b0cae7e8e52fabbfa39810ce2c8359db2f0 (patch) | |
| tree | e7cdb1c4330c5abd2a607d96cc7180a3795f2b44 /usr.sbin | |
| parent | 0651b2a3687f3222578dfb54981104919f73a7c8 (diff) | |
| download | FreeBSD-src-cb281b0cae7e8e52fabbfa39810ce2c8359db2f0.zip FreeBSD-src-cb281b0cae7e8e52fabbfa39810ce2c8359db2f0.tar.gz | |
MFC r286448: Disable 32-bit PIO for 6Gbit/s Intel SATA controllers.
For some reason 32-bit PIO writes are not working on 6Gbit/s Intel SATA
ports, while 16/32-bit PIO reads and 16-bit PIO writes are working fine.
3Gbit/s ports on the same controllers have no this problem.
Workaround this by disabling 32-bit PIO for all Intel controllers that may
have 6Gbit/s ports. It halves PIO performance from 6MB/s to 3MB/s, but
who bother about speed of such rare and slow mode, which is also highly
discouraged by SATA specifications?
Diffstat (limited to 'usr.sbin')
0 files changed, 0 insertions, 0 deletions
