Re: [squid-users] Lots of TCP_SWAPFAIL_MISS ?

From: Amos Jeffries <>
Date: Fri, 20 Jun 2014 19:42:01 +1200

On 20/06/2014 7:20 p.m., Per Jessen wrote:
> Amos Jeffries wrote:
>> On 17/06/2014 9:40 p.m., Per Jessen wrote:
>>> squid 2.7:
>>> Due to a kernel issue with ICMP redirects, my squid has been unused
>>> for 5-6 months, but after having found the fix, it's now active
>>> again.
>>> I'm now seeing quite a few TCP_SWAPFAIL_MISS, which I believe to
>>> mean "apparently cached, but cache not found" ? It's not IO error,
>>> so what else might this be caused by?
>> SWAPFAIL is I/O error or corrupted on-disk object.
> Hi Amos,
> There is no other option at all? I am 100% certain there are no I/O
> problems on this system. Also, without exception, the SWAPFAIL only
> affected openSUSE mirror sites which I cache. I could probably even
> reproduce and trace it.

Digging into the code it appears that it can also happen if you have
max_open_disk_fds configured and Squid exceeds that limit.

Otherwise, no, the only way to reach it is to get an error in the disk
I/O event handler when trying to load bytes from a cache file.

Received on Fri Jun 20 2014 - 07:42:26 MDT

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