Messages in this thread | | | Date | Wed, 12 Nov 1997 08:25:14 -0500 (EST) | From | "Steven N. Hirsch" <> | Subject | strace on smb/iozone |
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Bill,
It gets better all the time :-(.
Trace of 2.0.32 against share on WfW 3.11:
---- write(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 write(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 write(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 write(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 write(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 fsync(4) = 0 times({tms_utime=1, tms_stime=93, tms_cutime=0, tms_cstime=0}) = 31965548 close(4) = 0 open("iozone.tmp", O_RDONLY) = 4 write(1, "Writing the 1 Megabyte file, \'i"..., 62) = 62 times({tms_utime=1, tms_stime=93, tms_cutime=0, tms_cstime=0}) = 31965555 read(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 read(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 read(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 read(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 read(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 read(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 read(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512
----
Trace of 2.1.62 against same:
----
write(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 write(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 write(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 write(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 write(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 write(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 write(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512) = 512 fsync(4) = 0 times({tms_utime=2, tms_stime=43, tms_cutime=0, tms_cstime=0}) = 12162718 close(4) = 0 open("iozone.tmp", O_RDONLY) = 4 write(1, "Writing the 1 Megabyte file, \'i"..., 62) = 62 times({tms_utime=2, tms_stime=43, tms_cutime=0, tms_cstime=0}) = 12162725 read(4, "", 512) = 0 ^^^^^^^^
write(1, "Reading the file...Error reading"..., 41) = 41 _exit(1) = ?
----
For whatever reason, read() returns a zero length on the first call. Yet the file does exist. This suggests that something in the VFS or smbfs layer is in a race with the call and has not updated its notion of the file's state. FWIW, Bonnie behaves the same way; failing on the first read attempt.
I'd _really_ like to see this one nailed down, so let me know what other trickery might be required to narrow down the fault?
Steve
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