and I think I have seen around 10MB/sec when they are of 500KB (this
transfer at 10MB/sec was in parallel with another faster one however).
Yes I definitely confirm: right now I have just 1 rsync copy running,
it's in a zone where files are around 500KB on average, and it's going
at 9 MB/sec.
Stack traces of the writer process conform to what I have posted in my
previous email, even now that the writer is the only process using the
Excuse me, I am going nuts...
In this case of 9MB/sec for 500KB files, stack traces on the writer are
indeed very similar to what I have posted, but the relative frequency of
the two type of stack traces is different:
20%: waiting on the reader (this almost never happened when using
multiple parallel rsyncs)
The reader is waiting either on select (on the writer I guess) or on this:
[<ffffffffa031cd95>] xfs_read+0x115/0x2a0 [xfs]
[<ffffffffa031832b>] xfs_file_aio_read+0x5b/0x70 [xfs]