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2013 Jul 09
1
rsync speed limited by read chunk size?
...:
dd if=/tmp/ram1/Fedora-Live-Desktop.iso of=/dev/null bs=<value>
bs=512 1.2 GB/s
bs=1K 2.2 GB/s
bs=2K 3.5 GB/s
bs=4K 5.2 GB/s
bs=8K 6.8 GB/s
bs=64K 7.0 GB/s
Test 4: The reads from the raid with increasing read chunk size
resulted in better speeds. Notice the block size of 512 bytes is
164MB/sec which is similar to what we are seeing with rsync.
dd if=/data1/Fedora-Live-Desktop.iso of=/dev/null bs=<value>
bs=128 42 MB/s
bs=256 84 MB/s
bs=512 164 MB/s (dd's default bs size)
bs=1k 276 MB/s
bs=2k 567 MB/s
bs=4k 717 MB/s
bs=8k 938 MB/s
bs=16k 988 MB/s
bs=32k 1.1...