
Chapter II. Network (NIC/TOE)
Chelsio Unified Wire for Linux
67
Now the
generic-receive-offload
option is on. This means GRO is enabled. Please note that
there are two offload options here:
generic-receive-offload
and
large-receive-offload
.
This is because on this Linux system (RHEL6.0), the kernel supports both GRO and LRO. As
mentioned earlier, GRO is always the preferred option when both of them are present. On other
systems LRO might be the only available option. Then
ethtool
could be used to switch LRO on
and off as well.
When Linux’s GRO is enabled, Chelsio’s driver provides two GRO-related statistics. They are
displayed using the following command:
[root@host~]# ethtool -S eth6
...
GROPackets : 0
GROMerged : 897723
...
GROPackets
is the number of held packets. Those are candidate packets held by the kernel to be
processed individually or to be merged to larger packets. This number is usually zero.
GROMerged
is the number of packets that merged to larger packets. Usually this number increases
if there is any continuous traffic stream present.
ethtool
can also be used to switch off the GRO/LRO options when necessary:
[root@host~]# ethtool -K eth6 gro off
[root@host~]# ethtool -k eth6
Offload parameters for eth6:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp-segmentation-offload: on
udp-fragmentation-offload: off
generic-segmentation-offload: on
generic-receive-offload: off
large-receive-offload: off
The output above shows a disabled GRO.
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Страница 1: ...Chelsio Unified Wire for Linux i...
Страница 15: ...Chapter I Chelsio Unified Wire Chelsio Unified Wire for Linux 15 I Chelsio Unified Wire...
Страница 51: ...Chapter II Network NIC TOE Chelsio Unified Wire for Linux 51 II Network NIC TOE...
Страница 70: ...Chapter III Virtual Function Network vNIC Chelsio Unified Wire for Linux 70 III Virtual Function Network vNIC...
Страница 82: ...Chapter IV iWARP RDMA Chelsio Unified Wire for Linux 82 IV iWARP RDMA...
Страница 99: ...Chapter V iSER Chelsio Unified Wire for Linux 99 V iSER...
Страница 107: ...Chapter VI WD UDP Chelsio Unified Wire for Linux 107 VI WD UDP...
Страница 119: ...Chapter VII WD TOE Chelsio Unified Wire for Linux 119 VII WD TOE...
Страница 125: ...Chapter VIII NVMe oF Chelsio Unified Wire for Linux 125 VIII NVMe oF...
Страница 135: ...Chapter IX LIO iSCSI Target Offload Chelsio Unified Wire for Linux 135 IX LIO iSCSI Target Offload...
Страница 148: ...Chapter X iSCSI PDU Offload Target Chelsio Unified Wire for Linux 148 X iSCSI PDU Offload Target...
Страница 187: ...Chapter XI iSCSI PDU Offload Initiator Chelsio Unified Wire for Linux 187 XI iSCSI PDU Offload Initiator...
Страница 198: ...Chapter XII Crypto Offload Chelsio Unified Wire for Linux 198 XII Crypto Offload...
Страница 211: ...Chapter XIII Data Center Bridging DCB Chelsio Unified Wire for Linux 211 XIII Data Center Bridging DCB...
Страница 223: ...Chapter XIV FCoE Full Offload Initiator Chelsio Unified Wire for Linux 223 XIV FCoE Full Offload Initiator...
Страница 230: ...Chapter XIV FCoE Full Offload Initiator Chelsio Unified Wire for Linux 230...
Страница 235: ...Chapter XV Offload Bonding Chelsio Unified Wire for Linux 235 XV Offload Bonding...
Страница 258: ...Chapter XVIII Offload IPv6 Chelsio Unified Wire for Linux 258 XVIII Offload IPv6...
Страница 265: ...Chapter XIX WD Sniffing and Tracing Chelsio Unified Wire for Linux 265 XIX WD Sniffing and Tracing...
Страница 272: ...Chapter XX Classification and Filtering Chelsio Unified Wire for Linux 272 XX Classification and Filtering...
Страница 297: ...Chapter XXI OVS Kernel Datapath Offload Chelsio Unified Wire for Linux 297 XXI OVS Kernel Datapath Offload...
Страница 311: ...Chapter XXII Ring Backbone Chelsio Unified Wire for Linux 311 XXII Ring Backbone...
Страница 317: ...Chapter XXIII Traffic Management Chelsio Unified Wire for Linux 317 XXIII Traffic Management...
Страница 329: ...Chapter XXIV DPDK Driver Chelsio Unified Wire for Linux 329 XXIV DPDK Driver...
Страница 347: ...Chapter XXV Unified Boot Chelsio Unified Wire for Linux 347 XXV Unified Boot...
Страница 357: ...Chapter XXV Unified Boot Chelsio Unified Wire for Linux 357 iv Boot to EFI Shell...
Страница 427: ...Chapter XXVI Appendix A Chelsio Unified Wire for Linux 427 XXVI Appendix A...