[Samba] slow creating files

Pavel Plesov pavel.plesov at gmail.com
Wed Feb 15 22:36:57 MST 2012


Hello,
Have you checked the hardware ?
Tools like dmesg, atop and iostat can be very helpful here.
On Wed, Feb 8, 2012 at 17:10, Алексей Ганков <a.v.gankov at gmail.com> wrote:
> We tried to migrate from old Windows fileserver (p4, single HDD) to Samba
> (FedoraCore15, Samba 3.5.12-72.fc15, ext4 volume, xeon, raid5).
> Our pipeline is so, that some special software generates files on that
> fileserver.
> The typical filesize ~50 mbytes.
> On the old hardware, software (win2k3 server) the time of single file
> creation was about 10 seconds. On the new configuration it takes 20-25
> seconds.
> Copying of large files to\from samba server is ok (more than 80 mbytes\sec).
> It was default Samba installation.
> The usual tuning doesn't help at all (TCPNODELAY etc...)
>
> Is there any idea for tuning?
>
> Also, I wrote easy test that confused me:
>
> #include "stdio.h"
> #include "stdlib.h"
> #include "time.h"
> void main(int argc, char *argv[])
> {
> int fsize=40000000;
> int i=0;
> FILE *to;
> char
> str[]="0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890";
> time_t start, end;
> double diff;
>
> time(&start);
> to=fopen(argv[1], "w+");
> for(i=0; i < fsize/100; i++)
>    {
>    fprintf(to, "\n%7d-%s",i, str);
> /    fflush(to); // makes it slow!/
>    }
> fclose(to);
> time(&end);
> diff=difftime(end,start);
> printf("\n \t time_diff =  %.2lf", diff);
> }
>
> This was started on Win7 client PC, It creates about 40 mbytes size file in
> pointed path.
> Comparing timings on our samba share and win2k3 share gives: ~40 seconds on
> Samba and on  3-4 seconds win2k3!
> That means that fflush cause dramatically slow down of fileshare.
>
> Alexey
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-- 
Pavel Plesov


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