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author | attilio <attilio@FreeBSD.org> | 2009-05-30 15:14:44 +0000 |
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committer | attilio <attilio@FreeBSD.org> | 2009-05-30 15:14:44 +0000 |
commit | b523608331b881784ac18a7dfcb65c7a679130b0 (patch) | |
tree | 073ce0f089e7f642e36b12a238c6d66778db53f5 /sys/net/if.h | |
parent | d03ca3acc6b07da900f12523e3d2560f84b538c4 (diff) | |
download | FreeBSD-src-b523608331b881784ac18a7dfcb65c7a679130b0.zip FreeBSD-src-b523608331b881784ac18a7dfcb65c7a679130b0.tar.gz |
When user_frac in the polling subsystem is low it is going to busy the
CPU for too long period than necessary. Additively, interfaces are kept
polled (in the tick) even if no more packets are available.
In order to avoid such situations a new generic mechanism can be
implemented in proactive way, keeping track of the time spent on any
packet and fragmenting the time for any tick, stopping the processing
as soon as possible.
In order to implement such mechanism, the polling handler needs to
change, returning the number of packets processed.
While the intended logic is not part of this patch, the polling KPI is
broken by this commit, adding an int return value and the new flag
IFCAP_POLLING_NOCOUNT (which will signal that the return value is
meaningless for the installed handler and checking should be skipped).
Bump __FreeBSD_version in order to signal such situation.
Reviewed by: emaste
Sponsored by: Sandvine Incorporated
Diffstat (limited to 'sys/net/if.h')
-rw-r--r-- | sys/net/if.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/net/if.h b/sys/net/if.h index 30b9ccb..b73b46f 100644 --- a/sys/net/if.h +++ b/sys/net/if.h @@ -216,6 +216,7 @@ struct if_data { #define IFCAP_TOE4 0x04000 /* interface can offload TCP */ #define IFCAP_TOE6 0x08000 /* interface can offload TCP6 */ #define IFCAP_VLAN_HWFILTER 0x10000 /* interface hw can filter vlan tag */ +#define IFCAP_POLLING_NOCOUNT 0x20000 /* polling ticks cannot be fragmented */ #define IFCAP_HWCSUM (IFCAP_RXCSUM | IFCAP_TXCSUM) #define IFCAP_TSO (IFCAP_TSO4 | IFCAP_TSO6) |