Date: Fri, 24 May 2013 16:41:25 +0100 From: Igor Mozolevsky <igor@hybrid-lab.co.uk> To: Axel Fischer <afischer@marvell.com> Cc: Hackers freeBSD <freebsd-hackers@freebsd.org>, Markus Althoff <malthoff@marvell.com>, Lino Sanfilippo <lsanfil@marvell.com>, Igor Mozolevsky <igor@hybrid-lab.co.uk>, Ralf Assmann <rassmann@marvell.com> Subject: Low Tx-Rx performance with 10Gb NICs Message-ID: <CADWvR2hkjUMUpa-_R_RbkdJthERTeZNevAxe%2B6rZVA-sMy_qaQ@mail.gmail.com> In-Reply-To: <1369406798.20748.30.camel@EL-DT095.site> References: <175CCF5F49938B4D99B2E3EF7F558EBE381FA6E5AA@SC-VEXCH4.marvell.com> <CADWvR2g_VfZcCrXH1TcOVtPKT8GLbSKaqcH46piFBUjoOzXWUA@mail.gmail.com> <1369406798.20748.30.camel@EL-DT095.site>
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On Friday, 24 May 2013, Axel Fischer wrote: Additionally I noticed the following TCP errors > with netstat -s ...: > > 1186 data packets (1717328 bytes) retransmitted > 6847875 window update packets > 2319 duplicate acks > 25831 out-of-order packets (37403288 bytes) > 3733 discarded due to memory problems (drops) > 1186 segment rexmits in SACK recovery episodes > 1717328 byte rexmits in SACK recovery episodes > > > Looks like your data is flooding your memory buffers, have a look through https://calomel.org/freebsd_network_tuning.html -- Igor M.
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