Re: [PATCH] proposed scheduler enhancements and fixes

From: Dimitris Michailidis (dimitris@cthulhu.engr.sgi.com)
Date: Mon Feb 28 2000 - 19:26:29 EST

Next message: Phil N: "problem with IP addresses getting mangled - various NIC drivers and kernels"
Previous message: Gregory Hosler: "Re: 1024 byte sector file system problem."
In reply to: Andrea Arcangeli: "Re: [PATCH] proposed scheduler enhancements and fixes"
Next in thread: Nix: "Re: [PATCH] proposed scheduler enhancements and fixes"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

On 28-Feb-2000 Andrea Arcangeli wrote:
> On Sat, 26 Feb 2000, Dimitris Michailidis wrote:
>
>>This was MP (4 Xeon @500MHz). As another data point, on the same machine,
>>dbench 32 has a throughput of about 42MB/s with 2.3.40. With stock 2.3.47
>>it's just under 7MB/s and the CPUs have a much lower utilization (27% out
>>of the 4 CPUs versus 100+% with 2.3.40).

Some more info on this. With lighter load (dbench 8) I notice about 30%
drop in throughput with 2.3.47 when the buffer cache is cold. With warm
cache both kernels perform similarly. With dbench 32 the cold case shows
higher degradation (as noted above) and running with warm cache doesn't help.

> Please try again after:
>
> echo 95 > /proc/sys/vm/bdflush

OK, I tried this. Didn't do much.

-- Dimitris Michailidis dimitris@engr.sgi.com

- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/

Next message: Phil N: "problem with IP addresses getting mangled - various NIC drivers and kernels"
Previous message: Gregory Hosler: "Re: 1024 byte sector file system problem."
In reply to: Andrea Arcangeli: "Re: [PATCH] proposed scheduler enhancements and fixes"
Next in thread: Nix: "Re: [PATCH] proposed scheduler enhancements and fixes"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

This archive was generated by hypermail 2b29 : Tue Feb 29 2000 - 21:00:21 EST