Displaying 1 result from an estimated 1 matches for "max_payload_size".
2008 Mar 13
12
7-disk raidz achieves 430 MB/s reads and 220 MB/s writes on a $1320 box
...at the beginning of the platter -- I don''t know why it varies so much
between different units of the same model, additional seeks caused by
reallocated sectors perhaps) I found out that an important factor influencing
the max bandwidth of a PCI Express device such as the SiI3132 is the
Max_Payload_Size setting, which can be set from 128 to 4096 bytes by writing
to bits 7:5 of the Device Control Register (offset 08h) in the PCI Express
Capability Structure (starting at offset 70h on the SiI3132):
$ /usr/X11/bin/pcitweak -r 2:0 -h 0x78 # read the register
0x2007
Bits 7:5 of 0x2007 a...