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author | glebius <glebius@FreeBSD.org> | 2005-11-17 15:10:40 +0000 |
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committer | glebius <glebius@FreeBSD.org> | 2005-11-17 15:10:40 +0000 |
commit | 6a3275dc26b9cae9cb591eb51b5e2608d1b44010 (patch) | |
tree | 98959c6876b855f7fd8b1bbffa49773637dadbc2 /share | |
parent | 928d297eeb1b1084c1525eb3aba0cee109fed2b6 (diff) | |
download | FreeBSD-src-6a3275dc26b9cae9cb591eb51b5e2608d1b44010.zip FreeBSD-src-6a3275dc26b9cae9cb591eb51b5e2608d1b44010.tar.gz |
Document tunables.
Diffstat (limited to 'share')
-rw-r--r-- | share/man/man4/em.4 | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/share/man/man4/em.4 b/share/man/man4/em.4 index 279d039..7b1e8f1 100644 --- a/share/man/man4/em.4 +++ b/share/man/man4/em.4 @@ -31,7 +31,7 @@ .\" .\" $FreeBSD$ .\" -.Dd July 16, 2005 +.Dd November 17, 2005 .Dt EM 4 .Os .Sh NAME @@ -171,6 +171,42 @@ Intel PRO/1000 XF Server Adapter (82544) .It Intel PRO/1000 XT Server Adapter (82544) .El +.Sh LOADER TUNABLES +Tunables can be set at the +.Xr loader 8 +prompt before booting the kernel or stored in +.Pa /boot/loader.conf . +.Bl -tag -width indent +.It Va hw.em.rxd +Number of receive descriptors allocated by the driver. +The default value is 256. +The 82542 and 82543-based adapters can handle up to 256 descriptors, +while others can have up to 4096. +.It Va hw.em.txd +Number of transmit descriptors allocated by the driver. +The default value is 256. +The 82542 and 82543-based adapters can handle up to 256 descriptors, +while others can have up to 4096. +.It Va hw.em.rx_int_delay +This value delays the generation of receive interrupts in units of +1.024 microseconds. +The default value is 0, since adapters may hang with this feature +being enabled. +.It Va hw.em.rx_abs_int_delay +If +.Va hw.em.rx_int_delay +is non-zero, this tunable limits the maximum delay in which a receive +interrupt is generated. +.It Va hw.em.tx_int_delay +This value delays the generation of transmit interrupts in units of +1.024 microseconds. +The default value is 64. +.It Va hw.em.tx_abs_int_delay +If +.Va hw.em.tx_int_delay +is non-zero, this tunable limits the maximum delay in which a transmit +interrupt is generated. +.El .Sh DIAGNOSTICS .Bl -diag .It "em%d: Unable to allocate bus resource: memory" |