svn commit: r251297 - head/sys/dev/xen/netfront
Adam McDougall
mcdouga9 at egr.msu.edu
Tue Jun 18 13:30:37 UTC 2013
On 06/03/13 09:00, Andre Oppermann wrote:
> Author: andre
> Date: Mon Jun 3 13:00:33 2013
> New Revision: 251297
> URL: http://svnweb.freebsd.org/changeset/base/251297
>
> Log:
> Specify a maximum TSO length limiting the segment chain to what the
> Xen host side can handle after defragmentation.
>
> This prevents the driver from throwing away too long TSO chains and
> improves the performance on Amazon AWS instances with 10GigE virtual
> interfaces to the normally expected throughput.
>
> Submitted by: cperciva (earlier version)
> Reviewed by: cperciva
> Tested by: cperciva
> MFC after: 1 week
>
> Modified:
> head/sys/dev/xen/netfront/netfront.c
>
> Modified: head/sys/dev/xen/netfront/netfront.c
> ==============================================================================
> --- head/sys/dev/xen/netfront/netfront.c Mon Jun 3 12:55:13 2013 (r251296)
> +++ head/sys/dev/xen/netfront/netfront.c Mon Jun 3 13:00:33 2013 (r251297)
> @@ -134,6 +134,7 @@ static const int MODPARM_rx_flip = 0;
> * to mirror the Linux MAX_SKB_FRAGS constant.
> */
> #define MAX_TX_REQ_FRAGS (65536 / PAGE_SIZE + 2)
> +#define NF_TSO_MAXBURST ((IP_MAXPACKET / PAGE_SIZE) * MCLBYTES)
>
> #define RX_COPY_THRESHOLD 256
>
> @@ -2122,6 +2123,7 @@ create_netdev(device_t dev)
>
> ifp->if_hwassist = XN_CSUM_FEATURES;
> ifp->if_capabilities = IFCAP_HWCSUM;
> + ifp->if_hw_tsomax = NF_TSO_MAXBURST;
>
> ether_ifattach(ifp, np->mac);
> callout_init(&np->xn_stat_ch, CALLOUT_MPSAFE);
Can this and r251296 be MFC'ed yet or does it need more work to pass
muster? Thinking ahead to my next deployment build. Thanks.
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