| ae.4 (186738) | ae.4 (208027) |
|---|---|
| 1.\" Copyright (c) 2008 Stanislav Sedov <stas@FreeBSD.org> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 8 unchanged lines hidden (view full) --- 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" | 1.\" Copyright (c) 2008 Stanislav Sedov <stas@FreeBSD.org> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 8 unchanged lines hidden (view full) --- 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" |
| 25.\" $FreeBSD: head/share/man/man4/ae.4 186738 2009-01-04 15:48:38Z stas $ | 25.\" $FreeBSD: head/share/man/man4/ae.4 208027 2010-05-13 12:07:55Z uqs $ |
| 26.\" 27.Dd October 4, 2008 28.Dt AE 4 29.Os 30.Sh NAME 31.Nm ae 32.Nd "Attansic/Atheros L2 FastEthernet controller driver" 33.Sh SYNOPSIS --- 94 unchanged lines hidden (view full) --- 128.Sh SEE ALSO 129.Xr altq 4 , 130.Xr arp 4 , 131.Xr miibus 4 , 132.Xr netintro 4 , 133.Xr ng_ether 4 , 134.Xr vlan 4 , 135.Xr ifconfig 8 | 26.\" 27.Dd October 4, 2008 28.Dt AE 4 29.Os 30.Sh NAME 31.Nm ae 32.Nd "Attansic/Atheros L2 FastEthernet controller driver" 33.Sh SYNOPSIS --- 94 unchanged lines hidden (view full) --- 128.Sh SEE ALSO 129.Xr altq 4 , 130.Xr arp 4 , 131.Xr miibus 4 , 132.Xr netintro 4 , 133.Xr ng_ether 4 , 134.Xr vlan 4 , 135.Xr ifconfig 8 |
| 136.Sh HISTORY 137The 138.Nm 139driver and this manual page was written by 140.An Stanislav Sedov 141.Aq stas@FreeBSD.org . 142It first appeared in 143.Fx 7.1 . |
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| 136.Sh BUGS 137The Attansic L2 FastEthernet contoller supports DMA but does not use a 138descriptor based transfer mechanism via scatter-gather DMA. 139Thus the data should be copied to/from the controller memory on each 140transmit/receive. 141Furthermore, a lot of data alignment restrictions apply. 142This may introduce a high CPU load on systems with heavy network activity. 143Luckily enough this should not be a problem on modern hardware as L2 does 144not support speeds faster than 100Mbps. | 144.Sh BUGS 145The Attansic L2 FastEthernet contoller supports DMA but does not use a 146descriptor based transfer mechanism via scatter-gather DMA. 147Thus the data should be copied to/from the controller memory on each 148transmit/receive. 149Furthermore, a lot of data alignment restrictions apply. 150This may introduce a high CPU load on systems with heavy network activity. 151Luckily enough this should not be a problem on modern hardware as L2 does 152not support speeds faster than 100Mbps. |
| 145.Sh HISTORY 146The 147.Nm 148driver and this manual page was written by 149.An Stanislav Sedov 150.Aq stas@FreeBSD.org . 151It first appeared in 152.Fx 7.1 . | |