Hello,
On 12/20/2010 11:05 AM, Martin Steigerwald wrote:
> Hi!
>
> top - 10:49:07 up 3 days, 14:24, 8 users, load average: 2.31, 2.62, 2.28
> Tasks: 198 total, 2 running, 194 sleeping, 0 stopped, 2 zombie
> Cpu(s): 6.8%us, 93.2%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si,
> 0.0%st
> Mem: 2073660k total, 1941152k used, 132508k free, 153876k buffers
> Swap: 4000180k total, 243452k used, 3756728k free, 676612k cached
>
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 735 root 20 0 0 0 0 R 85.2 0.0 137:28.94 scsi_eh_11
>
> I don't see anything in dmesg. Everything appears to work as normal,
> except for the slowness. Which got a bit better upon renicing scsi_eh_11
> to 19 (not knowing whether its really safe, but it works for now).
>
> Interrupts appear to be within usual range as well:
Can you please apply the following patch, trigger the problem and
attach the kernel log?
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 5e59050..c748b5a 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -888,12 +888,19 @@ void ata_eh_fastdrain_timerfn(unsigned long arg)
*/
static void ata_eh_set_pending(struct ata_port *ap, int fastdrain)
{
+ static int xxx;
int cnt;
/* already scheduled? */
if (ap->pflags & ATA_PFLAG_EH_PENDING)
return;
+ if (!(ap->pflags & ATA_PFLAG_LOADING) && xxx < 16) {
+ ata_port_printk(ap, KERN_WARNING, "XXX ata_eh_set_pending()\n");
+ dump_stack();
+ xxx++;
+ }
+
ap->pflags |= ATA_PFLAG_EH_PENDING;
if (!fastdrain)
--
tejun
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