Date: Tue, 18 Jun 2013 09:30:35 -0400 From: Adam McDougall <mcdouga9@egr.msu.edu> To: svn-src-all@freebsd.org Subject: Re: svn commit: r251297 - head/sys/dev/xen/netfront Message-ID: <51C060FB.1020209@egr.msu.edu> In-Reply-To: <201306031300.r53D0XUx092178@svn.freebsd.org> References: <201306031300.r53D0XUx092178@svn.freebsd.org>
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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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