Messages in this thread | | | From | bryard@usa ... | Date | Thu, 21 Jan 1999 20:34:59 +0100 (MET) | Subject | TCP stalls in 2.2.0-final and earlier |
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There are strange TCP stalls in recent development kernel, at least from 2.1.132 and up that does not occur on 2.0.x. After a period of some seconds to several minutes of network activity over a PPP dialup connection (ISDN "modem" over serial port, 16550A, 115k2) nntp, imap and http connections begin to stall, while ping continues to work. For example, I see
# netstat -na Active Internet connections (including servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 42 212.242.4.81:1032 212.242.40.196:119 ESTABLISHED
It just sits there forever. It seems almost certain that the problem is triggered by disk activity.
# hdparm /dev/hda /dev/hda: multcount = 8 (on) I/O support = 1 (32-bit) unmaskirq = 1 (on) using_dma = 1 (on) keepsettings = 1 (on) nowerr = 0 (off) readonly = 0 (off) readahead = 8 (on) geometry = 1229/255/63, sectors = 19746720, start = 0
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