On 12-12-16 04:25 PM, Milan Broz wrote: > > In current kernels, work keeps on cpu which submitted it. So a single process doing parallel reads from multiple devices (I'm sure you could guess where I'm going with this) will never see more throughput than it would from a single device? If so, all the more reason to get multi-core support (for a single process of course) involved. :-/ > Please read > http://www.saout.de/pipermail/dm-crypt/2012-July/002582.html Yeah. I'm trying to see this "more processes" behavior but even the two dds each running in different shells are still attacking the same core. > (and try to run the second case with direct-io, iow add oflag=direct for dd) oflag=direct? # dd oflag=direct of=/dev/null if=/dev/mapper/t1-use bs=1M count=1000 dd: opening ‘/dev/null’: Invalid argument I guess O_DIRECT it not valid for /dev/null. Cheers, b.
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