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Date:      Fri, 07 Dec 2007 12:39:56 +0100
From:      Ivan Voras <ivoras@freebsd.org>
To:        freebsd-fs@freebsd.org
Subject:   readv: parallel or sequential?
Message-ID:  <fjbb3v$n60$1@ger.gmane.org>
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[-- Attachment #1 --]
Hi,

I found this in readv(2):

     For readv() and preadv(), the iovec structure is defined as:

           struct iovec {
                   void   *iov_base;  /* Base address. */
                   size_t iov_len;    /* Length. */
           };

     Each iovec entry specifies the base address and length of an area
in mem-
     ory where data should be placed.  The readv() system call will always
     fill an area completely before proceeding to the next.

Does this mean that, in effect, readv() is just a loop of read() calls
(minus syscall overhead)?


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