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Specify a maximum TSO length limiting the segment chain to what the

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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
This commit is contained in:
Andre Oppermann 2013-06-03 13:00:33 +00:00
parent 3c914c547e
commit 33e0730e2d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=251297
1 changed files with 2 additions and 0 deletions
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2
sys/dev/xen/netfront/netfront.c
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@ -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);