/proc/net/* read drops data (was: lost socket)
From: Ricky Beam (jfbeam_at_bluetronic.net)
Date: 08/28/03
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Date: Wed, 27 Aug 2003 19:58:17 -0400 (EDT) To: Linux Kernel Mail List <linux-kernel@vger.kernel.org>
On Wed, 27 Aug 2003, Ricky Beam wrote:
>This smells like a simple "off by one" bug, but I've been too busy to go
>look at the code.
Ah hah! it's a block size problem... netstat reads 1024 at a time.
Using dd...
[root:pts/5{9}]gir:~/[7:55pm]:dd if=/proc/net/udp bs=1024 | wc
2+1 records in
2+1 records out
18 216 2304
[root:pts/5{9}]gir:~/[7:56pm]:dd if=/proc/net/udp bs=2048 | wc
1+1 records in
1+1 records out
19 228 2432
[root:pts/5{9}]gir:~/[7:56pm]:dd if=/proc/net/udp bs=4096 | wc
0+1 records in
0+1 records out
20 240 2560
[root:pts/5{9}]gir:~/[7:56pm]:dd if=/proc/net/udp bs=8192 | wc
0+1 records in
0+1 records out
20 240 2560
[root:pts/5{9}]gir:~/[7:56pm]:dd if=/proc/net/udp bs=32768 | wc
0+1 records in
0+1 records out
20 240 2560
[root:pts/5{9}]gir:~/[7:56pm]:dd if=/proc/net/udp bs=1 | wc
2432+0 records in
2432+0 records out
19 228 2432
--Ricky
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- Previous message: Jamie Lokier: "Re: Lockless file reading"
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