Sendto(2) Never Reaches Wire

From: Michael B Allen (mba2000_at_ioplex.com)
Date: 02/19/05

  • Next message: Ian Zimmerman: "Re: libmba port to Solaris" 
    Date: Sat, 19 Feb 2005 00:16:59 -0500

    I'm writing some async dns client code. I've noticed that if I send a
    quick succession of 5 requests sometimes [1] the first two never reach
    the wire even though sendto(2) correctly reports the number of bytes written
    and select(2) claims the socket is writeable for each call. This isn't
    a problem because the retry code can compensate but it happends pretty
    consistently on my Linux 2.4.28 x86 laptop so I'm wondering if there's a
    way to avoid it. Is this normal for a sendto implementation? Can someone
    recommend a technique to maybe ensure a little higher success rate?

    Thanks,
    Mike

    [1] If I run tests back to back within a few seconds all requests are
    sent successfully but if I wait a few minutes the first two packets
    never reach the wire.

  • Next message: Ian Zimmerman: "Re: libmba port to Solaris"