TS-75XX Errata ethhang: Difference between revisions
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'''Workaround''': | '''Workaround''': | ||
TS-75XX/TS-4500 users wanting to utilize real-time responses without Ethernet plugged in will need to: | TS-75XX/TS-4500 users wanting to utilize real-time responses without Ethernet plugged in will need to either: | ||
1. Bring the eth0 interface down with the command: | 1. Bring the eth0 interface down with the command: | ||
<source lang=bash>ifconfig eth0 down</source> | <source lang=bash>ifconfig eth0 down</source> | ||
2. Recompile the kernel without the Ethernet driver from Cavium (.../drivers/net/str8100/star_nic.c) | 2. Recompile the kernel without the Ethernet driver from Cavium (.../drivers/net/str8100/star_nic.c) | ||
Latest revision as of 16:54, 22 March 2013
| Synopsis | 160ms Delay with ETH0 Disconnected |
| Severity | Minor |
| Class | Kernel Bug |
| Affected | All TS-75XX/TS-4500 Boards |
| Status | Workarounds available |
Description:
The Cavium STR8100 NIC driver was programmed with 160ms delays when Ethernet is physically disconnected (see function static void internal_phy_patch_check(int init) of .../drivers/net/str8100/star_nic.c). This causes delayed responses in real-time applications such as canctl. When Ethernet is physically connected, the issue is nonexistent.
Workaround:
TS-75XX/TS-4500 users wanting to utilize real-time responses without Ethernet plugged in will need to either:
1. Bring the eth0 interface down with the command:
ifconfig eth0 down
2. Recompile the kernel without the Ethernet driver from Cavium (.../drivers/net/str8100/star_nic.c)