Tuning if_bge for high packet rates (receive descriptors/transmit
winterny at gmail.com
Tue Jun 12 16:00:49 UTC 2007
We have some servers that have a very high packet rate in a normal
production mode, and require polling to keep the CPU load reasonable.
We have Kern.HZ=4000, and even still, have some dropped packets.
On our servers that use the intel "em" driver, we have tuned the
drivers as following, by default, if_em.h has:
#define EM_MIN_TXD 80
#define EM_MAX_TXD_82543 256
#define EM_MAX_TXD 4096
#define EM_DEFAULT_TXD EM_MAX_TXD_82543
#define EM_MIN_RXD 80
#define EM_MAX_RXD_82543 256
#define EM_MAX_RXD 4096
#define EM_DEFAULT_RXD EM_MAX_RXD_82543
We have changed EM_DEFAULT_TXD and EM_DEFAULT_RXD to 4096 -- This
solved the problem on these servers.
The question is now what to do on our servers with Broadcom "bge"
series cards. Does anyone know how to tune this driver in a similar
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