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| author | andre <andre@FreeBSD.org> | 2013-06-03 13:00:33 +0000 |
|---|---|---|
| committer | andre <andre@FreeBSD.org> | 2013-06-03 13:00:33 +0000 |
| commit | ad87662b891760b05f177fb279f8bc65c1665fa9 (patch) | |
| tree | a810e154888fb0873176a1642164d02b9bac3572 /sys/dev/xen | |
| parent | b706ceb4abd7f12c0ad38c0da053f4523814bcc4 (diff) | |
| download | FreeBSD-src-ad87662b891760b05f177fb279f8bc65c1665fa9.zip FreeBSD-src-ad87662b891760b05f177fb279f8bc65c1665fa9.tar.gz | |
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
Diffstat (limited to 'sys/dev/xen')
| -rw-r--r-- | sys/dev/xen/netfront/netfront.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/dev/xen/netfront/netfront.c b/sys/dev/xen/netfront/netfront.c index 6e3260d..f2dc3ac 100644 --- a/sys/dev/xen/netfront/netfront.c +++ b/sys/dev/xen/netfront/netfront.c @@ -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); |
