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From: Rolf Campbell <rcampbell AT tropicnetworks DOT com>
Subject: Re: (1.3.22) mount: strange 15 second delay
Date: Thu, 17 Apr 2003 23:02:28 -0400
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References: <b7ndcb$1pq$1 AT main DOT gmane DOT org> <20030418001208 DOT GC18611 AT redhat DOT com>
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Christopher Faylor wrote:
> On Thu, Apr 17, 2003 at 07:30:00PM -0400, Rolf Campbell wrote:
> 
>>I straced it (and the problem went away) so, I straced 'bash -c mount' 
>>and the problem came back.  The relavent portion of the strace is:
>>
>> 118    4305 [main] mount 2388 normalize_posix_path: src /dev/pipew
>>  87    4392 [main] mount 2388 normalize_posix_path: /dev/pipew = 
>>normalize_posix_path (/dev/pipew)
>> 113    4505 [main] mount 2388 mount_info::conv_to_win32_path: 
>>conv_to_win32_path (/dev/pipew)
>> 113    4618 [main] mount 2388 mount_info::conv_to_win32_path: 
>>src_path /dev/pipew, dst \dev\pipew, flags 0x2, rc 0
>>  90    4708 [main] mount 2388 fhandler_base::fstat: here
>> 100    4808 [main] mount 2388 fstat64: 0 = fstat (1, 0x22E8E0)
>>11282054 11286862 [main] mount 2388 writev: writev (1, 0x22FDE0, 1)
>> 257 11287119 [main] mount 2388 fhandler_base::write: binary write
>> 125 11287244 [main] mount 2388 fhandler_base::write: 399 = write 
>>(0xA0403D8, 399)
>>  90 11287334 [main] mount 2388 writev: 399 = write (1, 0x22FDE0, 1), 
>>errno 0
>>  91 11287425 [main] mount 2388 do_exit: do_exit (0)
>>
>>The 'writev' takes 11.2 seconds to complete.  Could somebody give me a 
>>hint what is going on here?
> The timestamp isn't time to complete.  It's time since last timestamp.
> So something between fstat and writev took 11282054 microseconds.
Ok, I recompiled the mount.exe program with -ggdb.  The delay was in on 
line 382.  The last call to getmntent (the one that returns NULL) is the 
one that takes > 10 seconds.

Was hoping that this would spark a thought in someone.  I'll start 
trying to get a debug cygwin load building to test further.

374:static void
375:show_mounts (void)
376:{
377:  FILE *m = setmntent ("/-not-used-", "r");
378:  struct mntent *p;
379:  const char *format = "%s on %s type %s (%s)\n";
380:
381:  // printf (format, "Device", "Directory", "Type", "Flags");
382:  while ((p = getmntent (m)) != NULL)
383:    printf (format, p->mnt_fsname, p->mnt_dir, p->mnt_type, 
p->mnt_opts);
384:  endmntent (m);
385:}



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