Messages in this thread | | | Date | Thu, 26 Sep 2002 09:04:28 +0200 | From | "Pedro M. Rodrigues" <> | Subject | Re: Warning - running *really* short on DMA buffers while doing file transfers |
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Jens Axboe wrote: > On Wed, Sep 25 2002, Mathieu Chouquet-Stringer wrote: > >> Hello! >> >>I've upgraded a while to 2.4.19 and my box has been happy for the last 52 >>days (it's a dual PIII). Tonight while going through my logs, I've found >>these: >> >>Sep 25 22:18:41 bigip kernel: Warning - running *really* short on DMA buffers >>Sep 25 22:18:47 bigip last message repeated 55 times >>Sep 25 22:19:41 bigip last message repeated 71 times > > > This is fixed in 2.4.20-pre > >
I reported this same problem some weeks ago - http://marc.theaimsgroup.com/?l=linux-kernel&m=103069116227685&w=2 . 2.4.20pre kernels solved the error messages flooding the console, and improved things a bit, but system load still got very high and disk read and write performance was lousy. Adding more memory and using a completely different machine didn't help. What did? Changing the Adaptec scsi driver to aic7xxx_old . The performance was up 50% for writes and 90% for reads, and the system load was acceptable. And i didn't even had to change the RedHat kernel (2.4.18-10) for a custom one. The storage was two external Arena raid boxes, btw.
Regards, Pedro
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