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SubjectRe: 2.6.24-git4+ regression
On Wed, Jan 30, 2008 at 02:56:09PM +0100, Lukas Hejtmanek wrote:
> Hello,
>
> I noticed short thread in LKM regarding "sched: add vslice" causes horrible
> interactivity under load.
>
> I can see similar behavior. If I stress both CPU cores, even typing on
> keyboard suffers from huge latencies, I can see letters appearing with delay
> (typing into xterm). No swap is used at all, having 1GB free RAM.
>
> I noticed this bad behavior with 2.6.24-git[46], 2.6.24-rc8-git was OK.

Hi Lukas,
Can you check if the patch below helps improve interactivity for you?

The patch is against 2.6.25-rc1. I would request you to check for
difference it makes with CONFIG_FAIR_GROUP_SCHED and
CONFIG_FAIR_USER_SCHED turned on.
---
kernel/sched.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
Index: current/kernel/sched.c
===================================================================
--- current.orig/kernel/sched.c
+++ current/kernel/sched.c
@@ -7431,8 +7431,8 @@

local_load = tg->cfs_rq[i]->load.weight;
local_shares = (local_load * total_shares) / total_load;
- if (!local_shares)
- local_shares = MIN_GROUP_SHARES;
+ if (!local_load)
+ local_shares = tg->shares;
if (local_shares == tg->se[i]->load.weight)
continue;

@@ -7710,7 +7710,7 @@
struct rq *rq = cfs_rq->rq;
int on_rq;

- if (!shares)
+ if (shares < MIN_GROUP_SHARES)
shares = MIN_GROUP_SHARES;

on_rq = se->on_rq;
--
Regards,
vatsa


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