Re: [perf-discuss] maxphys and sd_max_xfer_size

2008-04-06 Thread Ray Chambers
I am sorry, i see iostat few other things, but what does that tell you about your IO.. Size, time, throughput bla I actually had to trace this crap down.. To better understand i mounted a drive directio To remove any buffer.. to track my IO i wrote a simple C program that did a write of variou

[perf-discuss] maxphys and sd_max_xfer_size

2006-03-19 Thread Steven Sim
Hello all; I have always wondered why Sun's default value for maxphys is only 128Kbyte. In these days of EMC and other fibre related storages, it seemingly does not make sense. This above is especially so when sd_max_xfer_size is set to 1 Mbyte by default. Shouldn't the above values all