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From: "Folkert van Heusden" <folkert@vanheusden.com>
To: "'David Schwartz'" <davids@webmaster.com>
Cc: <linux-kernel@vger.kernel.org>
Subject: RE: TCP memory pressure question
Date: Sat, 23 Nov 2002 23:34:15 +0100
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> 	Any comments or suggestions are appreciated. I've found that when we hit
TCP
> memory pressure, many applications become very badly behaved.

What about:

int WRITE(int handle, char *whereto, int len)
{
        int cnt=len;

        while(len>0)
        {
                int rc;

                rc = write(handle, whereto, len);

                if (rc == -1)
                {
                        if (errno == EINTR)
				{
					/* just try again */
				}
				else if (errno == EAGAIN)
				{
					/* give up time-slice */
					if (sched_yield() == -1)
					{
						/* BIG troubles */
                              	syslog(LOG_DEBUG, "WRITE(), during EAGAIN
handling: sched_yield failed! [%d - %s]", errno, strerror(errno));
                               	return -1;
					}
				}
				else
                        {
                                syslog(LOG_DEBUG, "WRITE(): io-error [%d -
%s]", errno, strerror(errno));
                                return -1;
                        }
                }
                else if (rc == 0)
                {
                        return 0;
                }
                else
                {
                        whereto += rc;
                        len -= rc;
                }
        }

        return cnt;
}

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