Hi, I just ran into this table for a 10G Netgear switch we use: Fiberdelays: 10 Gbps vezelvertraging (64 bytepakketten): 1.827 µs 10 Gbps vezelvertraging (512 bytepakketten): 1.919 µs 10 Gbps vezelvertraging (1024 bytepakketten): 1.971 µs 10 Gbps vezelvertraging (1518 bytepakketten): 1.905 µs Copperdelays: 10 Gbps kopervertraging (64 bytepakketten): 2.728 µs 10 Gbps kopervertraging (512 bytepakketten): 2.85 µs 10 Gbps kopervertraging (1024 bytepakketten): 2.904 µs 10 Gbps kopervertraging (1518 bytepakketten): 2.841 µs Fiberdelays: 1 Gbps vezelvertraging (64 bytepakketten) 2.289 µs 1 Gbps vezelvertraging (512 bytepakketten) 2.393 µs 1 Gbps vezelvertraging (1024 bytepakketten) 2.423 µs 1 Gbps vezelvertraging (1518 bytepakketten) 2.379 µs Copperdelays: 1 Gbps kopervertraging (64 bytepakketten) 2.707 µs 1 Gbps kopervertraging (512 bytepakketten) 2.821 µs 1 Gbps kopervertraging (1024 bytepakketten) 2.866 µs 1 Gbps kopervertraging (1518 bytepakketten) 2.826 µs So the difference is serious: 900ns on a total of 1900ns for a 10G pakket. Other strange thing is that 1K packets are slower than 1518 bytes. So that might warrant connecting boxes preferably with optics instead of CAT cableing if you are trying to squeeze the max out of a setup. Sad thing is that they do not report for jumbo frames, and doing these measurements your self is not easy... --WjW _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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