Date: Sat, 21 Apr 2012 22:51:37 -0700 From: Vijay Singh <vijju.singh@gmail.com> To: Jack Vogel <jfvogel@gmail.com> Cc: freebsd-net@freebsd.org, Luigi Rizzo <rizzo@iet.unipi.it>, Sean Bruno <seanbru@yahoo-inc.com>, John Baldwin <jhb@freebsd.org> Subject: Re: igb(4) Raising IGB_MAX_TXD ?? Message-ID: <CALCNsJTYGTV_uO5dhu_XGmPAPFp5sZ1UwBv1t2Xcd=tXcgfA8w@mail.gmail.com> In-Reply-To: <CAFOYbcnXGM7ZMht5_LGp%2B7JJ9s4-8_NTdzx-U4pPLDcspUApMA@mail.gmail.com> References: <1334705064.4486.23.camel@powernoodle-l7.corp.yahoo.com> <1334767746.3466.6.camel@powernoodle-l7.corp.yahoo.com> <1334792417.19343.11.camel@powernoodle-l7.corp.yahoo.com> <201204190822.31010.jhb@freebsd.org> <CAFOYbcnXGM7ZMht5_LGp%2B7JJ9s4-8_NTdzx-U4pPLDcspUApMA@mail.gmail.com>
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>> FWIW, at my current employer we run with both rxd and txd cranked up to 32k >> (we had to patch the driver as you suggested) and have not had any problems >> doing that for a couple of years now. John et al, is this limit specific to igb, or is it applicable to the ixgbe as well. From the 8.x driver code I see: 100/* 101 * TxDescriptors Valid Range: 64-4096 Default Value: 256 This value is the 102 * number of transmit descriptors allocated by the driver. Increasing this 103 * value allows the driver to queue more transmits. Each descriptor is 16 104 * bytes. Performance tests have show the 2K value to be optimal for top 105 * performance. 106 */ 107#define DEFAULT_TXD 1024 108#define PERFORM_TXD 2048 109#define MAX_TXD 4096 110#define MIN_TXD 64 Can the igxbe be extended beyond 4k transmit descriptors well? -vijay
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